Explicitly remove DELETED records when calculating collection universe.  Fixes the problem with deleted records in virtual collections reported by Robert Forkel.
Explicitly remove DELETED records when calculating collection
universe.  Fixes the problem with deleted records in virtual
collections reported by Robert Forkel.

tiborsimko/invenio-search,tiborsimko/invenio-records,inveniosoftware/invenio-records,tiborsimko/invenio-records,tiborsimko/invenio-search,inveniosoftware/invenio-records,inveniosoftware/invenio-search,inveniosoftware/invenio-search