Small patch that fixes some crashes:

• Crash when entering a previously visited system by transport in system without station (this also caused crashes in other situations).
• Crash when leaving an expressway junction where the expressway has only one junction. (These 1 junction expressways are a mistake but I can't remove them now because existing games might depend on them being there).
• Start of a gameplay FAQ in the game manual.

My thanks to Darko and strandd505.