Clear the snapshot array when we're done applying an op so that we don't  retain references that will interfere with garbage collection.
Clear the snapshot array when we're done applying an op so that we don't 
retain references that will interfere with garbage collection.


git-svn-id: 64ebf368729f38804935acb7146e017e0f909c6b@1792 6335cc39-0255-0410-8fd6-9bcaacd3b74c

samskivert/samskivert,samskivert/samskivert