Pull request #588: CAS-13738
Merge in CASA/casa6 from CAS-13738 to master
* commit 'f9dd8a6c9143fa7f9251dd664e447e834628d280':
mention casatestutils in the casatasks readme
mention casatestutils depency and location of tool test output in readme
translate any PYTHONPATH values to absolate paths before using them in casatools setup.py
casatasks setup.py change to show exception information when caught while importing from casatools
remove closure short-circuit (CAS-13738) CAS-13738 start searching for casa version since the most recent tag 6.4.4.6 CAS-13738 choose which tools tests get run with 'setup.py test --tests=...'
