SCU assist bugs/improvements

[Crotalus]

There seems to be some problems with SCUs and assisting:

* When SCUs are assisting other builders they won't start building even if within build distance. They wait for the "parent" builder before they start/walk, unlike engineers.

* What exactly does assist ground do? Assist ground with SCUs doesn't seem to do anything. It should assist everything in an area.

* Thirdly, SCU rebuild seems to be working badly, only activates when assisting a factory and that dies. It would be cool if everything in an area gets rebuilt if you are assist ground. (good for fire bases for instance).


I've tried to mod in this but I cannot find where it's all defined. I guess somewhere in the AI code?