* Update the krell institute products to use the latest features of spack for building on cluster platforms.
* Address travis error messages and resubmit the pull request.
* Update the contents of openspeedshop package.py so it passes the flake8 tests.
* Fix flake8 error-whitespack issue in mrnet package.py file.
* Add updates based on spack reviewer feedback.
* More fixes based on comments from reviewers. Switch using extend to using append, remove additional setting of PATH and LD_LIBRARY_PATH that should not be required due to RPATH.
* More review related changes. Update MPIOption.append lines and take out xercesc references.
* Create a base options function for common openspeedshop base cmake options to reduce redundencies.
* Add libxml2+python depends on to get around issues with the libxml2 package file.