Version 3.30.0

[David]

This version is really a minor update.
Three track libraries have been updated:

*Märklin I - note: the missing Huebner turnouts will be added later
*Märklin C (H0)
*Kato Unitrack N
*Lionel Fastrack

Furthermore, an annoying error when trying to set direction for Kato double track segments is solved. Now by just not allowing it. Later, this will be fixed in a better way.

A small number of internal improvements.

David.