map fix

[_1SMV_Gitano]

Hello,

I agree with JacksonsGhost, not all airdromes need to be rated rated for large aircraft. In any case I managed to launch 8 fully laden A20 from Merzhausen spawning in the runway. With taxi-to-takeoff feature it should be possible to make more aircraft take-off safely.
The twin runways, like Eindhoven, are indeed troublesome. I could remove the western one but this might result in conflicts with old mission.

I will fix a couple of spawn points, one in "Frankfurt" airdrome and one in "Metzbroek".