(arg_type): at_icregexp label removed (obsolete).
(pattern): New member multi_line for multi-line regexps.
(filebuf): A global buffer containing the whole file as a string
for multi-line regexp matching.
(need_filebuf): Global flag raised if multi-line regexps used.
(print_help): Document new regexp modifiers, remove references to
obsolete option --ignore-case-regexp.
(main): Do not set regexp syntax and translation table here.
(main): Treat -c option as a backward compatibility hack.
(main, find_entries): Init and free filebuf.
(find_entries): Call regex_tag_multiline after the regular parser.
(scan_separators): Check for untermintaed regexp and return NULL.
(analyse_regex, add_regex): Remove the ignore_case argument, which
is now a modifier to the regexp. All callers changed.
(add_regex): Manage the regexp modifiers.
(regex_tag_multiline): New function. Reads from filebuf.
(readline_internal): If necessary, copy the whole file into filebuf.
(readline): Skip multi-line regexps, leave them to regex_tag_multiline.
(add_regex): Better check for null regexps.
(readline): Check for regex matching null string.
(find_entries): Reorganisation.
if node has no next, previous or up links.
Hide the part of the first line that is used in the header.
Use Info-next-link-keymap, etc.
(Info-next-link-keymap, Info-prev-link-keymap)
(Info-up-link-keymap): New variables.
(Info-setup-header-line): Function deleted.
(Info-mode): Make Info-header-line local.
(Info-fontify-node): Ignore Info-use-header-line.
Unconditionally compute what the header line should be, and
store it on the `header-line' property of the node's first char.
Bind [header-line down-mouse-1].
Use `keymap' property, not `local-map'.
Bind [mouse-2] for mouse clicks on the node line in the text.
(font-lock-set-defaults): Variable alist settings moved back into
font-lock-set-defaults-1.
(turn-on-font-lock-if-enabled): Always turn on font-lock unless it
is specifically excluded by the user.
Remove prev_(fkey|keytran}_(map|start|end) since we don't want to pass
things through those maps after downcasing events.
Enforce that keytran_end <= fkey_start, i.e. that key-translation-map
applies after function-key-map.
Make sure that keytran can be done in the middle in the sequence.
Be careful not to throw away events past the one we downcase.
