I made several changes to the aztec config site file. They include 
switching to a new location for the third party libraries, changing
the version of mpi to MVAPICH2 instead of MVAPICH, removing some
commented out libraries, and adding support for Uintah.



git-svn-id: http://visit.ilight.com/svn/visit/trunk/src@23861 18c085ea-50e0-402c-830e-de6fd14e8384