Fix problems caused by new implementation of sub-word mode

* lisp/subr.el (forward-word-strictly, backward-word-strictly):
New functions.
(word-move-empty-char-table): New variable.

* etc/NEWS: Mention 'forward-word-strictly' and
'backward-word-strictly'.

* doc/lispref/positions.texi (Word Motion): Document
'find-word-boundary-function-table', 'forward-word-strictly', and
'backward-word-strictly'.  (Bug#22560)

* src/syntax.c (syms_of_syntax)
<find-word-boundary-function-table>: Doc fix.

* lisp/wdired.el (wdired-xcase-word):
* lisp/textmodes/texnfo-upd.el (texinfo-copy-node-name)
(texinfo-copy-section-title, texinfo-start-menu-description)
(texinfo-copy-menu-title, texinfo-specific-section-type)
(texinfo-insert-node-lines, texinfo-copy-next-section-title):
* lisp/textmodes/texinfo.el (texinfo-clone-environment)
(texinfo-insert-@end):
* lisp/textmodes/texinfmt.el (texinfo-format-scan)
(texinfo-anchor, texinfo-multitable-widths)
(texinfo-multitable-item):
* lisp/textmodes/tex-mode.el (latex-env-before-change):
* lisp/textmodes/flyspell.el (texinfo-mode-flyspell-verify):
* lisp/skeleton.el (skeleton-insert):
* lisp/simple.el (count-words):
* lisp/progmodes/vhdl-mode.el (vhdl-beginning-of-libunit)
(vhdl-beginning-of-defun, vhdl-beginning-of-statement-1)
(vhdl-update-sensitivity-list, vhdl-template-block)
(vhdl-template-break, vhdl-template-case, vhdl-template-default)
(vhdl-template-default-indent, vhdl-template-for-loop)
(vhdl-template-if-then-use, vhdl-template-bare-loop)
(vhdl-template-nature, vhdl-template-procedural)
(vhdl-template-process, vhdl-template-selected-signal-asst)
(vhdl-template-type, vhdl-template-variable)
(vhdl-template-while-loop, vhdl-beginning-of-block)
(vhdl-hooked-abbrev, vhdl-port-copy, vhdl-hs-forward-sexp-func):
* lisp/progmodes/verilog-mode.el (verilog-backward-sexp)
(verilog-forward-sexp, verilog-beg-of-statement)
(verilog-set-auto-endcomments, verilog-backward-token)
(verilog-do-indent):
* lisp/progmodes/vera-mode.el (vera-guess-basic-syntax)
(vera-indent-block-closing):
* lisp/progmodes/simula.el (simula-context)
(simula-backward-up-level, simula-forward-down-level)
(simula-previous-statement, simula-next-statement)
(simula-skip-comment-backward, simula-calculate-indent)
(simula-find-if, simula-electric-keyword):
* lisp/progmodes/sh-script.el (sh-smie--rc-newline-semi-p):
* lisp/progmodes/ruby-mode.el (ruby-smie--redundant-do-p)
(ruby-smie--forward-token, ruby-smie--backward-token)
(ruby-singleton-class-p, ruby-calculate-indent)
(ruby-forward-sexp, ruby-backward-sexp):
* lisp/progmodes/ps-mode.el (ps-run-goto-error):
* lisp/progmodes/perl-mode.el (perl-syntax-propertize-function)
(perl-syntax-propertize-special-constructs)
(perl-backward-to-start-of-continued-exp):
* lisp/progmodes/pascal.el (pascal-indent-declaration):
* lisp/progmodes/octave.el (octave-function-file-p):
* lisp/progmodes/mantemp.el (mantemp-insert-cxx-syntax):
* lisp/progmodes/js.el (js--forward-function-decl):
* lisp/progmodes/idlwave.el (idlwave-show-begin-check)
(idlwave-beginning-of-block, idlwave-end-of-block)
(idlwave-block-jump-out, idlwave-determine-class):
* lisp/progmodes/icon.el (icon-is-continuation-line)
(icon-backward-to-start-of-continued-exp, end-of-icon-defun):
* lisp/progmodes/hideif.el (hide-ifdef-define):
* lisp/progmodes/f90.el (f90-change-keywords):
* lisp/progmodes/cperl-mode.el (cperl-electric-pod)
(cperl-linefeed, cperl-electric-terminator)
(cperl-find-pods-heres, cperl-fix-line-spacing)
(cperl-invert-if-unless):
* lisp/progmodes/cc-engine.el (c-forward-<>-arglist-recur):
* lisp/progmodes/cc-align.el (c-lineup-java-inher):
* lisp/progmodes/ada-mode.el (ada-compile-goto-error)
(ada-adjust-case-skeleton, ada-create-case-exception)
(ada-create-case-exception-substring)
(ada-case-read-exceptions-from-file, ada-after-keyword-p)
(ada-scan-paramlist, ada-get-current-indent, ada-get-indent-end)
(ada-get-indent-if, ada-get-indent-block-start)
(ada-get-indent-loop, ada-get-indent-type)
(ada-search-prev-end-stmt, ada-check-defun-name)
(ada-goto-decl-start, ada-goto-matching-start)
(ada-goto-matching-end, ada-looking-at-semi-or)
(ada-looking-at-semi-private, ada-in-paramlist-p)
(ada-search-ignore-complex-boolean, ada-move-to-start)
(ada-move-to-end, ada-which-function, ada-gen-treat-proc):
* lisp/net/quickurl.el (quickurl-grab-url):
* lisp/mail/sendmail.el (mail-do-fcc):
* lisp/mail/rmail.el (rmail-resend):
* lisp/mail/mailabbrev.el (mail-abbrev-complete-alias):
* lisp/mail/mail-extr.el (mail-extract-address-components):
* lisp/json.el (json-read-keyword):
* lisp/files.el (insert-directory):
* lisp/emacs-lisp/checkdoc.el (checkdoc-this-string-valid-engine):
* lisp/completion.el (symbol-under-point, symbol-before-point)
(symbol-before-point-for-complete, next-cdabbrev)
(add-completions-from-c-buffer):
* lisp/cedet/semantic/texi.el (semantic-up-context)
(semantic-beginning-of-context):
* lisp/cedet/semantic/bovine/el.el (semantic-get-local-variables):
use 'forward-word-strictly' and 'backward-word-strictly' instead
of 'forward-word' and 'backward-word'.

[This reapplies commit c1d32a6537,
which was inadvertently lost by merge commit
c71e7cc113.]

lisp/progmodes/cperl-mode.el

@@ -2304,7 +2304,7 @@ to nil."
 		     (memq this-command '(self-insert-command newline))))
 	head1 notlast name p really-delete over)
     (and (save-excursion
-	   (forward-word -1)
+	   (forward-word-strictly -1)
 	   (and
 	    (eq (preceding-char) ?=)
 	    (progn
@@ -2327,7 +2327,7 @@ to nil."
 	       (progn
 		 (insert "\n\n=cut")
 		 (cperl-ensure-newlines 2)
-		 (forward-word -2)
+		 (forward-word-strictly -2)
 		 (if (and head1
 			  (not
 			   (save-excursion
@@ -2335,7 +2335,7 @@ to nil."
 			     (re-search-backward "\\(\\`\n?\\|\n\n\\)=head1\\>"
 						 nil t)))) ; Only one
 		     (progn
-		       (forward-word 1)
+		       (forward-word-strictly 1)
 		       (setq name (file-name-base)
 			     p (point))
 		       (insert " NAME\n\n" name
@@ -2343,10 +2343,10 @@ to nil."
 			       "=head1 DESCRIPTION")
 		       (cperl-ensure-newlines 4)
 		       (goto-char p)
-		       (forward-word 2)
+		       (forward-word-strictly 2)
 		       (end-of-line)
 		       (setq really-delete t))
-		   (forward-word 1))))
+		   (forward-word-strictly 1))))
 	   (if over
 	       (progn
 		 (setq p (point))
@@ -2354,7 +2354,7 @@ to nil."
 			 "=back")
 		 (cperl-ensure-newlines 2)
 		 (goto-char p)
-		 (forward-word 1)
+		 (forward-word-strictly 1)
 		 (end-of-line)
 		 (setq really-delete t)))
 	   (if (and delete really-delete)
@@ -2480,7 +2480,7 @@ If in POD, insert appropriate lines."
 	(if (and over
 		 (progn
 		   (forward-paragraph -1)
-		   (forward-word 1)
+		   (forward-word-strictly 1)
 		   (setq pos (point))
 		   (setq cut (buffer-substring (point) (point-at-eol)))
 		   (delete-char (- (point-at-eol) (point)))
@@ -2531,7 +2531,7 @@ If in POD, insert appropriate lines."
 		     ;; and do no indentation for them.
 		     (and (eq last-command-event ?:)
 			  (save-excursion
-			    (forward-word 1)
+			    (forward-word-strictly 1)
 			    (skip-chars-forward " \t")
 			    (and (< (point) end)
 				 (progn (goto-char (- end 1))
@@ -4309,7 +4309,7 @@ the sections using `cperl-pod-head-face', `cperl-pod-face',
 		  ;; Now: tail: if the second part is non-matching without ///e
 		  (if (eq (char-syntax (following-char)) ?w)
 		      (progn
-			(forward-word 1) ; skip modifiers s///s
+			(forward-word-strictly 1) ; skip modifiers s///s
 			(if tail (cperl-commentify tail (point) t))
 			(cperl-postpone-fontification
 			 e1 (point) 'face my-cperl-REx-modifiers-face)))
@@ -5110,7 +5110,7 @@ Returns some position at the last line."
 	(if (looking-at
 	     "[ \t]*}?[ \t]*\\<\\(\\els\\(e\\|if\\)\\|continue\\|unless\\|if\\|while\\|for\\(each\\)?\\|until\\)\\>\\(\t*\\|[ \t][ \t]+\\)[^ \t\n#]")
 	    (progn
-	      (forward-word 1)
+	      (forward-word-strictly 1)
 	      (delete-horizontal-space)
 	      (insert (make-string cperl-indent-region-fix-constructs ?\s))
 	      (beginning-of-line)))
@@ -5119,7 +5119,7 @@ Returns some position at the last line."
 	(if (looking-at
 	     "[ \t]*\\<for\\(each\\)?[ \t]+\\(my\\|local\\|our\\)\\(\t*\\|[ \t][ \t]+\\)[^ \t\n]")
 	    (progn
-	      (forward-word 2)
+	      (forward-word-strictly 2)
 	      (delete-horizontal-space)
 	      (insert (make-string cperl-indent-region-fix-constructs ?\s))
 	      (beginning-of-line)))
@@ -8502,7 +8502,7 @@ the appropriate statement modifier."
 		    (insert B " ")
 		    (and B-comment (insert B-comment " "))
 		    (just-one-space)
-		    (forward-word 1)
+		    (forward-word-strictly 1)
 		    (setq pre-A (point))
 		    (insert " " A ";")
 		    (delete-horizontal-space)