ENH: Add helper function to save state
ENH: Add helper function to save state

Sanitizes the Atom.__getstate() function for any blacklisted
Atom members that are unimportant for state saving or
non-JSON-serializable

tacaswell/dataportal,tacaswell/dataportal,ericdill/datamuxer,NSLS-II/dataportal,NSLS-II/dataportal,ericdill/databroker,danielballan/datamuxer,danielballan/datamuxer,NSLS-II/datamuxer,ericdill/databroker,danielballan/dataportal,danielballan/dataportal,ericdill/datamuxer