Added support for the %GROUP% wildcard.

%GROUP% is the same as %USER% except it's done on each group a user is
in.
%USER% and %GROUP% cannot be mixed on an ACL line.
Change default groupwildcards option to 0 not to change behavior of
already installed wikis
Colon is no longer rewritten to semicolon for IIS 7.x and for older versions of IIS, semicolon is displayed as is, not URL-encoded.
removed names from footnotes and removed anchors from headings altogether
use abbr instead of deprecated acronym
removed align attribute from images and inserted them only in the feed (FS#1351)

can someone with better regex skills please revise this?
renamed smiley image class to 'icon' (FS#1970)
added some wanting classes
load only one stylesheet for all modes instead of three

Instead of three stylesheets for 'all', 'screen' and 'print' modes, they are all loaded into a single stylesheet by wrapping all screen styles in a "@media screen {}" and all print styles in a "@media print {}". The 'all' mode is not wrapped in anything.
Potential issues with existing CSS: If any of your screen or print CSS files already contain any "@media" syntax, the CSS will probably break. In that case please add any CSS with "@media" in it to the 'all' mode instead!

Also, the 'rtl' mode is hereby deprecated. Please just prefix any RTL styles within your normal CSS files with "[dir=rtl]". This also fixes that RTL styles cannot be added for 'all' or 'print' modes.
moved the mobile part of the rtl styles (including @media) into mobile.css
minor changes to gradients: quotes around data-uris and commented css solution
moved contents of rtl.css into other CSS files
rewrote and improved HTML for TOC

Attention: Template authors need to adjust their CSS!

Original structure:
div.toc >
  div#toc__header.tocheader.toctoggle > span#toc__toggle.toc_close|toc_open > span
  div#toc__inside > ul.toc > li.level1 > div.li > span.li > a.toc

New structure:
div#dw__toc.open|close >
  h3 > strong > span
  ul.toc > li.toc > div.li > a
improved HTML for search results

Attention: Template authors need to adjust their CSS!

Original structure:
div.search_result >
  a.wikilink1 > span.search_cnt
  br
  div.search_snippet

New structure:
dl.search_results >
  dt > a.wikilink1
  dd
added accidentally removed jquery-ui styles back again
made TOC togling script more generic

Instead of a dedicated function to toggle the TOC we now have a function
that allows to use this functionality everywhere. This will be used to
toggle the sidebar in the mobile view (in an upcoming patch).

Note, this required some changes to the CSS (to make it more generic).
The CSS is still located in the TOC sections but should probably be
moved into its own section instead.
mobile styles for the TOC structure changes
collapse sidebar in mobile view FS#2473
improved toc changes and sidebar toggling
match on img tag in feed's img align replacement

this should avoid false positive matches on user content (which is
already escaped at this point)