This patch changes the requirements of the phase technologies:
- Town phase from five village structures to one corral, farmstead, house, and storehouse.
- City phase from four town structures to one blacksmith, market, and temple.
As a consequence building towers or military structures no longer brings you closer to the next, which means there is now a greater differentiation between early strategies (e.g. neglecting defences and military to rush to city phase, or train more units instead).
The petra AI advances to the phases without difficulty (which is a relief).
I'm not entirely sure about the correct amount of indentation (@elexis?).