backport extra help search logic to 2.7RC from trunk.


git-svn-id: svn+ssh://portal-auth.nersc.gov/project/projectdirs/visit/svn/visit/branches/2.7RC/src@21905 18c085ea-50e0-402c-830e-de6fd14e8384
merge from trunk - added the ability to create ramped opacity mapping

git-svn-id: svn+ssh://portal-auth.nersc.gov/project/projectdirs/visit/svn/visit/branches/2.7RC/src@21907 18c085ea-50e0-402c-830e-de6fd14e8384
merge from trunk - flag for turning off affinity code with apple

git-svn-id: svn+ssh://portal-auth.nersc.gov/project/projectdirs/visit/svn/visit/branches/2.7RC/src@21908 18c085ea-50e0-402c-830e-de6fd14e8384