fix terminals along the same track

finer platform textures and fewer glitches

fix crash when joining consecutive tracks into different terminals (UG should do this)

better handling of multiple underground levels. Reconfigure your existing underground stations after this.

added help for extra platforms

new flat exits for passengers and cargo, more underpasses, x-ray fixed

easier initial placement

bugfixes: several things work better now

some more bugfixes with the automatic links

fixed a crash when configuring underground stations