Battle of Britain remake of PSS game CodeSVN

Experience is not added instantly now. It is stored as "gained experience" which will be added at the end of the day. So results of pilots' learning in combat are not in effect until the next day. This will prevent fluctuations of experience during the day (eventually lowered at the end of the day by recruits coming to squadrons as replacements) which would be unrealistic.
Added new conditions to painting squadrons on the map: squadrons with status = 7 (mission completed) are painted. German squadrons which are not spotted by radar or observers on ground - are not painted.

Adding experience after air combat.

Landing menu now warns when airfield is closed or its runway damaged. Squadron can't choose to land on closed airfield.

Refueling and rearming time now affected by amount of damage inflicted to airfield.

Added hidden German airfields at the eastern edge of the map - these will be their starting positions in regular game. German squadrons can land now and be refueled and rearmed.

Bombing airfields: added destroying planes on ground by attacking Luftwaffe bombers.
Added mission target X and Y coordinates to starting data of squadrons (data which is read from file).

Trying some code to destroy planes present on airfield that is being bombed.

Minor bug fix and adjustments to bombing sequence.

Planes bombs their targets. Checks if individual bomber hit its target and how much damage is inflicted. Changes statuses of targets based on damage inflicted.
Still needs some testing. Minor bugs present.

Airfield.java: first draft of inflictDamage method