simplify the way petra deals with worker

git-svn-id: http://svn.wildfiregames.com/public/ps/trunk@15921 3db68df2-c116-0410-a063-a993310a9797
petra: push priority of first market and remove some unnecessary ===

git-svn-id: http://svn.wildfiregames.com/public/ps/trunk@15922 3db68df2-c116-0410-a063-a993310a9797
Persian market variations upgrade. Added ao/normal/spec and made the stalls conform to the terrain.

git-svn-id: http://svn.wildfiregames.com/public/ps/trunk@15923 3db68df2-c116-0410-a063-a993310a9797
Merge 'remotes/trunk'