BibFormat: PEP8 fixes in bibreformat

* Fixes PEP8 issues in `bibreformat`.  (PR #2220)

Signed-off-by: Esteban J. G. Gabancho <esteban.gabancho@gmail.com>
Reviewed-by: Tibor Simko <tibor.simko@cern.ch>
BibFormat: recjson update using bibreformat

* Adds `recjson` to the list of available formats that `bibreformat`
  could use.  (closes #1708) (PR #2220)

Signed-off-by: Esteban J. G. Gabancho <esteban.gabancho@gmail.com>
Reviewed-by: Tibor Simko <tibor.simko@cern.ch>