User.php: tag functions
User.php: tag functions

Change getTopTags to use _getTagData function.
Change getTagForArtist to use Artist->getTags function.
New getPersonalTags function.
New getTagInfo function.

foocorp/gnu-fm,foocorp/gnu-fm,foocorp/gnu-fm,foocorp/gnu-fm,foocorp/gnu-fm,foocorp/gnu-fm,foocorp/gnu-fm,foocorp/gnu-fm,foocorp/gnu-fm