added the ability to split tags, inverse of the tag merge functionality
remove unused function
fix formatting
Merge branch 'TagSplit' of https://github.com/jcwmoore/ampache into jcwmoore-TagSplit
changes suggested by @SUTJael
remove tag splitting and change the tag merge functionality to allow merging to multiple tags
added the ability to keep existing tag mappings
Merge branch 'TagSplit' of https://github.com/jcwmoore/ampache into jcwmoore-TagSplit
Change update revision
Merge branch 'jcwmoore-TagSplit' into develop

Conflicts:
	lib/class/update.class.php