Battle of Britain remake of PSS game CodeSVN

Modified method of calculating hit probability in fighters' combat - now uses difference between combat value (CV) of attacker and defender. Earlier probability was based on attacker's CV only.

Fighters' combat done. Next are fighters attacking bombers. Applying losses to squadrons will be made at the end of combat (not added yet).

Adjustments in combat processing. Added better ammo expending - proportional to number of planes involved in combat. Still, British squadrons may attack only once but such ammo expending better reflects ability of German squadrons to fight after several combats with intercepting British squadrons.

Adjustments in combat processing

Added counting number of planes in all RAF and Luftwaffe squadrons taking part in combat.

Added calculating combat value of all RAF and Luftwaffe squadrons in particular combat.

Added code to calculate squadron's combat value

Airfield menu is refreshing constantly now.

Airfield menu complete.

Fixed location of info box on screen (was wrong when map window was moved)