Added concurrent editing detection
Added post relations
Fixed navigating between posts
Updated TODO
Fixed post view for anonymous users
Refactored search filters
Simplified injecting db connection for upgrades
Added post history
Improved layout for various screens sizes
Fixed error messages covered with content spinner
Fixed post source being a link when it shouldn't
Added reverse image search on IQDB and Google Images
Added searching by tags and ids
Added post searching by date
Added post favoriting
Added favorite count to post list
Changed default order to descending
Reduced aliases for searches
Added order:fav_date and order:fav_count support
Improved focus style for items in user list