Vega Strike / Code / Commit [r13610]

Commit [r13610] Maximize Restore History

Add more py2 compatibility imports, not sure they're *required*, but

they're correct.

Authored by: klaussfreire 2013-03-29

changed	/trunk/data/modules/dynamic_battle.py
changed	/trunk/data/modules/launch.py
changed	/trunk/data/modules/ship_upgrades.py
changed	/trunk/data/modules/stardate.py
changed	/trunk/data/modules/trading.py
changed	/trunk/data/modules/vsrandom.py