Multi-layer and hex buildings

[Mobhack]

I vaguely recollect that - multiple hex buildings laid paving stones as well, and also had to be laid only on level 0 terrain IIRC.

Several other things had to be on level 0 terrain - like fields, single hex buildings and some other stuff.

It was not a simple thing to go to the 15 levels hills of our versions, and we also managed to get things allowed on terrain levels greater then the flat - like fields and buildings IIRC. (Its been a loing time since I wrassled with the code to get thete).

Any quirkyness the multi-hex buildings have is probably linked to a remnant of the old style code that laid those paved areas, I probably have not quite removed all of whatever it was.