geshifilter 5.x-2.7

Changes since DRUPAL-5--2-6:

• #226724 by aclight: typo
• changed installation a bit: only some popular languages are enabled by default instead of all 80
• worked on usability of GeSHi library path setting
• fixed minor issue with cache of available languages
• fixed issue with teaser mode chopping the closing '?>' from '<?php...?>' code blocks
• fixed issue with user logout urls in simpletest tests
• synchronized some parts with HEAD, ported http://drupal.org/cvs?commit=103996
• #252621: "Do nothing" mode could not be overruled with language attributes or language tags
• moved stuff from geshifilter.module to geshifilter.inc, brought geshifilter.conflicts.inc, geshifilter.filtertips.inc, geshifilter.pages.inc and geshifilter.inc in more sync with HEAD versions for easier maintenance
• refactored code from geshifilter.module to geshifilter.admin.inc to make geshifilter.module smaller
• #244493: added CSS mode where only CSS classes are added to the markup and the administrator is responsible for defining the CSS rules