Exit mase, gives option to save modified sequences.
Beware: QUIT calls UNMAP.  This is to guarantee that one will 
be able to respond correctly to the QUIT queries.  QUIT will 
verify that you really want to exit MASE.
If you say ``NO'', you will resume editing.  
Remember that all of your bindings would be lost (this may mean your
cursors will no longer function).