BibUpload: fill affected_fields in hstRECORD

* BibUpload now stores list of affected fields for given record
  revision update into hstRECORD table.  (closes #1572)

Signed-off-by: Grzegorz Szpura <grzegorz.szpura@cern.ch>
Reviewed-by: Tibor Simko <tibor.simko@cern.ch>