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New {language} and @regexp features.

(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.

(comint-mode-hook): Turn on font-lock by default.

  check, thanks to Robert Thorpe <robert.thorpe@antenova.com> for
  noticing.  Redocument.

arguments.

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.

without first making sure it's bound.

(lookup_char_property): Use XCAR/XCDR.

(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.

(calc-trail-mode): Use an italic `font-lock-face'.
(calc-refresh): Ditto.

(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.

Added format-mode-line.

(frame_title_buf, frame_title_buf_end, frame_title_ptr)
(store_frame_title_char, store_frame_title): Use unconditionally.
(init_xdisp): Defsubr Fformat_mode_line.
Initialize frame_title_buf etc. unconditionally.

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.

FOCUS_IN_EVENT events and return 0 if nothing else in buffer.