Add Scalasca 2.1
Merge branch 'develop' of ssh://cz-stash.llnl.gov:7999/scale/spack into develop
SPACK-19 no longer an issue. Removing libtool copy.
Use external argparse in spack list, for 2.6 compatibility.
Add bib2xhtml
Fix for SPACK-43: compiler finding fails gracefully on unknown error.