PHP Mode for Emacs Code

(php-mode): Add "\s *" after "&?" in
defun-prompt-regexp, since functions can have an ampersand before
the identifier with whitespace added.
(php-speedbar-config, php-mode-speedbar-open, php-manual-url)
(php-mode-force-pear): Remove backslash that causes continuation
of the line in docstrings.

(Completion): Give example of making a
php-completion-file from the PHP manual HTMl files.
(Change Logs): Add index entries to this section.
(Customization): Add notes as source code comments about what
should be documented in this section.

Commit rest of changes intended for 2008-04-12 fixes.

Make grammatical throughout document.
(Introduction): Add description of intended audience.
(Editing): Document mark-defun, narrow-to-defun and widen.
(Contributors): Add Aaron Iba.

Insert various comments for maintaining the
manual.

Update modification date to today's date.

(php-font-lock-keywords-1, php-font-lock-keywords-2): Add [^_$] to
beginning and [^_] to end of font-lock regular expressions to
avoid false matches in user variable and function names. Affects
highlighting of self, parent, print, break, case, continue, other
keywords and internal constants.

Add missing paren from last commit.

(php-mode-modified): Use a string literal rather than a computed
value.

(php-tags, php-tags-key): Move definition to above
php-mode to avoid byte compiler warning. Use eval-when-compile
for regexp-opt.
(php-font-lock-keywords-1): Use font-lock-preprocessor-face for
PHP and ASP tags.