Massive gallery-module-wide search and replace for new class names.
Fix MTPP -> MPTT typo in comments.
Massive manual gallery-module-wide search and replace.  Many of these are only in comments.
- fixed when used with call_user_func(), call_user_func_array(), glob().
- fixed when found with _block, _event, _installer, _rest, _rss, _task, _theme.
- fixed when found with _Controller, _Model, _Driver, and _Core.
- fixed when found as file_proxy, User_Model, and Group_Model.
Follow-on to previous commit - forgot to save these and include them, too.
Merge pull request #230 from shadlaws/k3_gallery_search_n_replace

Massive gallery-module-wide search and replace.  Around 2800 changes in total.