casa

       New Development: No
            JIRA Issue: No
        Ready for Test: No
     Interface Changes: No
What Interface Changed: 
         Test Programs: 
  Put in Release Notes: No
             Module(s): 
           Description:

Modified build framework to better support unit testing:

o Changed depedencies such that all accepted unit tests will
  now be built but not run during normal make process.

o Added full support for google test.  Downloads GT from github and configures
  it to be built.  See code/install/GoogleTestInstall.cmake
  for more details.

o Fixed tProgressMeter so that it compiles.

Note the fixes are designed to only work on Linux x64 for the time
being.  When they can be tested on OSX that restriction can be
removed.