* 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.
Package repositories now look like this:
top-level-dir/
repo.yaml
packages/
libelf/
package.py
mpich/
package.py
...
This leaves room at the top level for additional metadata, source,
per-repo configs, indexes, etc., and it makes it easy to see that
something is a spack repo (just look for repo.yaml and packages).
