Fix mod priority. Add user mod support. Fixes #1838.

git-svn-id: http://svn.wildfiregames.com/public/ps/trunk@13167 3db68df2-c116-0410-a063-a993310a9797
Mauryan Corral model

git-svn-id: http://svn.wildfiregames.com/public/ps/trunk@13168 3db68df2-c116-0410-a063-a993310a9797
Adds more dependency options to NVTT CMake scripts.
Disables more unneeded NVTT libs in build-osx-libs.sh (avoids link error with MacPorts' libtiff installed)

git-svn-id: http://svn.wildfiregames.com/public/ps/trunk@13170 3db68df2-c116-0410-a063-a993310a9797
Added normal, parallax and spec maps for all Mauryan buildings - except for those who aren't done yet. 
Added normal, parallax and spec maps for the Mauryan ships.
~Gen.Kenobi


git-svn-id: http://svn.wildfiregames.com/public/ps/trunk@13171 3db68df2-c116-0410-a063-a993310a9797
Suppresses noisy Boost header warnings on OS X by including them as system headers, refs #1076.
Bumps default SDK in build-osx-bundle.sh to 10.7 (newer Xcode doesn't include 10.6).
Fixes using xml2-config from SDK when needed.
Fixes more linker warnings about symbol visibility by compiling libs with fvisibility=hidden.
Updates some comments in the build scripts.

git-svn-id: http://svn.wildfiregames.com/public/ps/trunk@13172 3db68df2-c116-0410-a063-a993310a9797
Improved normal/spec maps. Added parallax support for the Mauryans.


git-svn-id: http://svn.wildfiregames.com/public/ps/trunk@13173 3db68df2-c116-0410-a063-a993310a9797
Fixed Parallax mapping for the Mauryan roofs. 

git-svn-id: http://svn.wildfiregames.com/public/ps/trunk@13174 3db68df2-c116-0410-a063-a993310a9797
Merge remote-tracking branch 'remotes/trunk'