- Fixed a bug where autosaved nid was not cleared when node is not submitted....

- Fixed a bug where autosaved nid was not cleared when node is not submitted. Subsequent nodes will then use this nid which screws up everything.
- Uncommented a code which is supposed to clear messages after a node is autosaved; don't wanna bombard users with too many messages in the next page they visit.
- Added a few comments.