textmarc2xmlmarc: remove content regexp check

* Removes content regexp check in textmarc2xmlmarc to allow
  controlfields.  This fixes failed regression test in BibMatch.
  (closes #1267)

Tested-by: Tibor Simko <tibor.simko@cern.ch>
BibDocFile: revert md5 property patch

* Reverts md5 property patch 18c013cd7e511cb83d742e70bb0972e426ae0b0e
  that was defining only getter, not setter.  This caused problems
  during recreation of demo site.  (references #1249)

Reported-by: Patrick Glauner <patrick.oliver.glauner@cern.ch>
Merge branch 'master' into next

* master:
  BibDocFile: revert md5 property patch
  textmarc2xmlmarc: remove content regexp check