BibFormat: fix for eval_format_element return type

Reported-by: Henning Hraban Ramm <invenioml@fiee.net>
Signed-off-by: Tibor Simko <tibor.simko@cern.ch>
NEWS: fix v1.1.3 version number

Signed-off-by: Tibor Simko <tibor.simko@cern.ch>
Merge branch 'maint-1.1'

* maint-1.1:
  NEWS: fix v1.1.3 version number