Allow setting of stream version in the DB.

Allow setting of the nVersion parameter used for stream serialisation in
the database.
Remove unused "attack" field from character state.

Remove never used "attack" variable from the character state.  Bump
version to 1.0.08 so that DB updates can be done accordingly.
Add nDisasterHeight to game state.

Add a new field to the game state that remembers when the last disaster
was triggered.