BibAuthorID: add index on aidPERSONIDPAPERS.flag
BibAuthorID: add index on aidPERSONIDPAPERS.flag

* Adds an index on the flag column of the aidPERSONIDPAPERS table,
  speeding up certain BibAuthorID SQL queries by a factor of 10
  for INSPIRE site conditions.

inveniosoftware/invenio,tiborsimko/invenio,inveniosoftware/invenio,tiborsimko/invenio