decay optimization to skip materials with only isotopes of long half life.
now record normalized version of composition to output db.
made resource buffers more exact for popqty calls
Merge branch 'exact-buf' of github.com:rwcarlsen/cyclus into rwcarlsen-exact-buf
fix commented out catch line
Merge branch 'decay-trick' of github.com:rwcarlsen/cyclus into rwcarlsen-decay-trick
added test that decay shortcut works
Merge branch 'decay-trick' of github.com:rwcarlsen/cyclus into rwcarlsen-decay-trick
Merge branch 'fix' of github.com:rwcarlsen/cyclus into rwcarlsen-fix
pep8'd install.py and added some ease of use flags, e.g., --test and --build-only, and made --replace --clean-build, which seems a little more intuitive.