Use the range manager to pick entities when drawing a selection box during a game. This allows for a significant performance improvement.

Fixes #2961, patch by @aBothe.

git-svn-id: http://svn.wildfiregames.com/public/ps/trunk@16068 3db68df2-c116-0410-a063-a993310a9797
Automated build.

git-svn-id: http://svn.wildfiregames.com/public/ps/trunk@16069 3db68df2-c116-0410-a063-a993310a9797
Update the Greek Acropolis (4) map description to remove the reference to the old non-skirmish map.

git-svn-id: http://svn.wildfiregames.com/public/ps/trunk@16070 3db68df2-c116-0410-a063-a993310a9797
Merge 'remotes/trunk'