Added unit test for _deleted in update_doc_mult
Added unit test for _deleted in update_doc_mult

scionrep/scioncc,scionrep/scioncc,mkl-/scioncc,crchemist/scioncc,mkl-/scioncc,crchemist/scioncc,ooici/pyon,scionrep/scioncc,mkl-/scioncc,ooici/pyon,crchemist/scioncc