petra: first step towards use of heroes

git-svn-id: http://svn.wildfiregames.com/public/ps/trunk@15654 3db68df2-c116-0410-a063-a993310a9797
Revert Surprise commits by Mythos_Ruler, r16447 and r16444 following team decision. They will be put in a separate git branch. This is done to avoid conflict with scythetwirler's balance branch and potential other work in that area.

git-svn-id: http://svn.wildfiregames.com/public/ps/trunk@15655 3db68df2-c116-0410-a063-a993310a9797
Change the vision range together with the attack range for some techs. Refs #2736. Patch by serveurix

git-svn-id: http://svn.wildfiregames.com/public/ps/trunk@15656 3db68df2-c116-0410-a063-a993310a9797
New Iberian tower models

git-svn-id: http://svn.wildfiregames.com/public/ps/trunk@15657 3db68df2-c116-0410-a063-a993310a9797
petra: prevent JS errors when expected buildings do not exist (for mods)

git-svn-id: http://svn.wildfiregames.com/public/ps/trunk@15658 3db68df2-c116-0410-a063-a993310a9797
remove debug output from previous commit

git-svn-id: http://svn.wildfiregames.com/public/ps/trunk@15659 3db68df2-c116-0410-a063-a993310a9797
Merge 'remotes/trunk'