Fix a UnitAI issue where a builder would become idle if, upon completion of a foundation, it was close enough to immediately start working on another foundation. This was particularly infuriating with palisades.

git-svn-id: http://svn.wildfiregames.com/public/ps/trunk@15580 3db68df2-c116-0410-a063-a993310a9797
let allies build and repair stuff

git-svn-id: http://svn.wildfiregames.com/public/ps/trunk@15581 3db68df2-c116-0410-a063-a993310a9797
Petra: prevent stuck units when a transport ship is destroyed

git-svn-id: http://svn.wildfiregames.com/public/ps/trunk@15582 3db68df2-c116-0410-a063-a993310a9797
Merge 'remotes/trunk'