ZAS procs are now more standardized, needs more comments though.
Connections between zones now self-manage themselves, adjusting things if/when the turfs they are on change zones. (The check for this is very efficient and fast, but a bit hard to read codewise)
Zone share percent set to 4. Seems to work well.
In certain cases, zones would be emptied completely of turfs, thereby causing division by zero errors in FEA due to operations involving group_multiplier.
