Thomson software list updates:

to_flop.xml version 2:
Now uses parent/clone sets for alts to comply with rest of MESS software lists
Add usage instructions for some special loading cases (basic 1.0, chg files...)
Move some disks to moto_flop.xml
Various cleanups.

New software list moto_flop.xml for floppy-based programs that work on both MO and TO systems - more disks will likely be moved here after further testing.