Modified several settings for initial play.

 - 512x512 map
 - realistic acceleration
 - increased max train/roadveh count (500->3000)
 - increased max aircraft and shifts (200,300->500)
 - reduced chances of plane crashes
 - increased station spread (12->15)
 - randomized town layout (chooses between normal, improved, 2x2, 3x3 per town)
 - disabled exclusive rights
 - do not show finances by default at the month's end
 - removed several default server/client name pairings from the template
 - automatically renew vehicles 6 months after lifecycle end with the same model, if possible