Drag-and-drop functionality was added. An MP3 can
be dragged from your file manager onto the main
window and PGID3 will open the tags for that file.
PGID3 is also now able to store the Track field,
bringing the ID3v1 support up to Spec 1.1. (The
ID3v2 support was already able to handle this.)
The GUI was rewritten. Lots of internal cleanups
were performed.
