Trap Ctrl-C

Make it go back to the cf-sketch> prompt instead of exiting
the program.
Merge pull request #420 from zzamboni/fix/trap_ctrl_c

Trap Ctrl-C
Explicitely set bundle entry point for activation

Explicitly set the entry point in parameter sets, this fixes potential
confusion when more than one entry point has the same API.
Merge pull request #423 from zzamboni/fix/multiple_entry_point_activation

Explicitly set bundle entry point for activation
Make "list val" show the descriptions.
Merge pull request #424 from zzamboni/master

Make "list val" show the descriptions.