[cosmetic] invert arwork list and group list in set view (refs #18)
[cosmetic] changed title for artwork view page (closes #15)
[fix] corrected punctuation
[evol] added artwork view and now use the new image frame in all views
[evol] added group view and linked it from the tree and set views
[evol] added set view and linked it from tree view
[fix] sets should be ordered in tree view
[evol] created display_artwork_frame() helper function and now use it in the welcome page + created a set/group tree view with it too