Battle of Britain remake of PSS game CodeSVN

Fixed problem with showing wrong squadrons in airfield menu, when actually or previously chosen airfield had no squadrons landed.

End of day seems to be working properly (really).

End of day one seems to be working properly but hangs on end of day two.

Commencing new day after previous day's summary.

Reinforcements Box appears at the end of the day.
Added jumping to new day but something is wrong with airfield handling.

Better refresh of data in day's summary table.
Squadrons are coming back to home airfields at the end of the day and then they are refueled and rearmed.

Day's summary done along with command ability calculation.

Improved day's summary and english locales in calendar.

When selecting squadron which is part of a group, selection changes automatically to group leader.

Date and time now handled with Calendar class.
Probably eliminated problem with mouse not responding sometimes to user input. Problems with map painting occured when mouse coordinates were drawn - now switched off.
A little improved day's summary.