sonnb - XenGallery (XenForo Gallery) 2.6.10

- Added IP.Gallery 5.0.2+ importer to convert your Categories, Albums, Photos and Comments from IPB.Gallery version 5.0.2+ to XenGallery.
You must previously imported from IPB and you must have the archived import log to perform this action.
- Added Thread Import Permission for users import their own threads to Gallery.
There are two permissions: Import Own Threads and Import Any Thread(Mod Permission).
Users are able to edit album's title, category, import comments and choose which attachments are going to be imported.
Please note that for big threads with thousand of attachments and posts, it would use noticeable performance so only assign this permission
to the User Group that you trust.
+ A thread only can be imported once.
+ Threads without attachments could not be imported.
- Added alt attribute to img tags (using album/photo's descriptions).
- Other minor changes.

- Fixed undefined index issue with newsfeed for albums.
- Fixed album view and photo view issue in some dark template.
- Other minor bug fixes.