many fauna sounds in stereo converted to mono so the OpenAL can locate them

git-svn-id: http://svn.wildfiregames.com/public/ps/trunk@13440 3db68df2-c116-0410-a063-a993310a9797
New techs for Carthage: Mercenary Captains, reduce metal costs for merc units, based on ethnicity.

Melee cav more starting pierce armor.

git-svn-id: http://svn.wildfiregames.com/public/ps/trunk@13441 3db68df2-c116-0410-a063-a993310a9797
Merge remote-tracking branch 'remotes/trunk'