* Pause the game instead of blocking when cargo dest link graph jobs lag.
* Update routing restrictions patch:
* Program GUI changes to make 'or if' conditions easier to add, remove and use.
* Add a 'reserve through' program command.
* Add a 'reserve through' program command.
If a restricted PBS signal uses this command, PBS reservations which would otherwise stop at this signal instead continue through it to the next signal/waiting point. In effect this allows the 'safe waiting point' property of a PBS signal to be conditionally turned off.
* Improvements to the correctness and thoroughness of the program validator.