Terrain analysis now only picks a start point if it is within a region
of size >10.
The economy code only does a distance check if there are >100 entities
of that resource on the map so rare resources are gathered.
Modified some debug output as well.
This was SVN commit r10773.
Key changes are:
Support for Persians
Revamped defence system supoprting groups of attackers
Dynamic priorities based on enemy strength and number of workers
Better placement of towers and fortresses
Randomised raiding in early game
This was SVN commit r10755.
