- Changed Exodus plugin handling of ElementBlock decomposition to use an enum scalar instead of a material
    - Added read options to Exodus plugin to control material variable detection
    - Added read option to control Exodus' plugin auto-detection of composite variables
    - Improved Exodus plugin auto-detection of composite variables
    - Changed Exodus plugin to deal with composite variables as expressions instead of database variables
    - Enhanced Subset and Label plots to handle enum scalars (thanks to help from Jeremy!)
    - Enhanced Nameschemes to handle embedded strings that are themselves other Nameschemes
    - Added some tests to Namescheme_test to test embedded nameschemes
    - Enhanced DBOptionsAttributes to include browseable help text
    - Enhanced GUI DBOptionsDialog with help button to display options help
    - Changed avtDatabaseMetaData::DetermineVarType() to return UNKNOWN instead of excepting out 


git-svn-id: http://visit.ilight.com/svn/visit/trunk/src@25266 18c085ea-50e0-402c-830e-de6fd14e8384