* doc/misc/tramp.texi (Remote processes): Rewrite subsection
"Running remote processes on MS Windows hosts".
* etc/NEWS: Mention remote process support for Tramp's "smb" method.
Presentational fixes and improvements.
* lisp/net/tramp-smb.el (tramp-smb-file-name-handler-alist):
Use `tramp-smb-handle-make-process', `tramp-smb-handle-shell-command'
and `tramp-handle-start-file-process'.
(tramp-smb-matching-line): New defvar.
(tramp-smb-handle-make-process, tramp-smb-handle-shell-command)
(tramp-smb-shell-prompt): New defuns.
(tramp-smb-handle-process-file): Rewrite.
(tramp-smb-handle-start-file-process): Remove.
(tramp-smb-get-localname, tramp-smb-shell-quote-localname):
New optional argument SHARE.
(tramp-smb-send-command): Remove echoed command string.
(tramp-smb-maybe-open-connection): Initialize variables.
(tramp-smb-wait-for-output): Wait more robust.
(tramp-smb-call-winexe): Check for share. Goto current directory.
(tramp-smb-connection-local-powershell-variables): New defconst.
Set it as connection local variables.
* test/lisp/net/tramp-tests.el (tramp-test28-process-file)
(tramp-test29-start-file-process, tramp-test30-make-process)
(tramp-test32-shell-command, tramp--test-async-shell-command)
(tramp--test-supports-processes-p): Adapt for "smb" method.
(tramp-test34-explicit-shell-file-name)
(tramp-test45-asynchronous-requests): Skip for "smb" method.
(tramp--test-check-files): Skip shell test for some special
characters in the "smb" case.
(tramp-test52-unload): Disable further tests.