1) I added a host profile for Trinity.

2) I modified the internal launcher so that it would work properly on
   Trinity. The system and our python were getting intermingled causing
   a link issue when submitting a batch job on trinity. The change was
   to unset the python path information before submitting the batch job.



git-svn-id: http://visit.ilight.com/svn/visit/trunk/src@29443 18c085ea-50e0-402c-830e-de6fd14e8384