REF: Change names for more back-consistency; add get_item; fix bug.
REF: Change names for more back-consistency; add get_item; fix bug.

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