HerdtheBEAST

BEAST production version for a large herd of HST projects.

Changes:

• python 2 support dropped
• splitting run_beast.py up to be more pythonic
• AGB model atmospheres added
• generalized dust extinction curves (via dust_extinction package)
• can simulate observations based on physics/observation model
• observationmodel split by background or source density
• very simple splinter observationmodel added
• symlog used to support negative values in log pPDFs
• various documentation updates and bugfixes