SotBE S5: balancing adjustments to gold, turns, AI parameters

The goal is to make the scenario harder and, more importantly, to
reduce the gold carry-over.
SotBE S6: balancing adjustments to gold, turns, AI parameters

Reduce turn limit, make AI more aggressive with slightly more gold, but
also give the player some more gold, as the carry-over from the
previous scenario is a lot less.
SotBE S6: slightly different location for one of the allied AI orcs

So that it does not end up blocking a village on Turn 2.