- bugfix: version mismatch error does not show (#223354)

- task: language prefix handling in gallery_menu

- task: switch G2 debug mode (buffered)

- bugfix: gallery_menu admin fails if no gallery block is enabled

(requires G2.3/svn and is still volatile, for early testing only)

Make checking for a valid gallery install more robust (do not just trust the gallery_valid variable, but always do an isreadable check as well -- avoid case of a moved drupal/g2 installation causing PHP errors).

#61507 Fixed missing require of gallery_user.inc

 again once the correct methods to import module css files has been documented
 (see http://drupal.org/node/60096).
 - The css file is now not included twice on gallery pages (is correctly loaded
   after Gallery2's theme.css file and so can override)
 - This *removes* the functionality to use a theme specific drupal_g2.css file.
   There have got to be better ways to override module css files.
 - css improvements to not hide h2's in G2 Admin pages
 - Removed DOS line endings from gallery_filter.inc

Split gallery_block into separate .inc file.
Added configuration of g2Image file types.
#57894 - Fixed theme specific css file import.