Addded fromDict() function to ID3v2Tag. Added fromDict() and
toDict() functions to the TagUnion class (uses the first non-empty tag).
Added fromDict() and toDict() functions for the generic Tag class, only
handling common tags without duplicates. Addded preliminary mp3 test
case. Python3 bindings now available on my github site.
though much of this could be moved into the base class as there's a lot
of copy-paste action going on.
git-svn-id: svn://anonsvn.kde.org/home/kde/trunk/kdesupport/taglib@768992 283d02a7-25f6-0310-bc7c-ecb5cbfe19da