Added Panel displaying some informations.
Add "+" sign on tab when it's not in clean state.
Changed deepcopy to specialised clone() methods

I know about __deepcopy__(self, memo), just don't like it. This whole 'memo' map is horrible!
Meanwhile clone() works more-less like normal copy constructors.
Removed subconvert-gui.py (legacy)
Changed order on window title.

Now: ${FILEMAME} - Subconvert
Added help menu.