jsonalchemy: fix `six.iteritems` typo

Signed-off-by: Jiri Kuncar <jiri.kuncar@cern.ch>
documents: fix for model creation

Signed-off-by: Jiri Kuncar <jiri.kuncar@cern.ch>
jsonalchemy: import and PEP8 fixes

Co-authored-by: Esteban J. G. Gabancho <esteban.gabancho@gmail.com>
Signed-off-by: Adrian-Tudor Panescu <adrian.tudor.panescu@cern.ch>
jsonalchemy: UUID validation fix

Signed-off-by: Adrian-Tudor Panescu <adrian.tudor.panescu@cern.ch>
jsonalchemy: `uuid` and `objectid` validator fix

Signed-off-by: Jiri Kuncar <jiri.kuncar@cern.ch>
base: config PEP8 improvements

Signed-off-by: Jiri Kuncar <jiri.kuncar@cern.ch>
jsonalchemy: validator test fix

Signed-off-by: Jiri Kuncar <jiri.kuncar@cern.ch>
jsonalchemy: bug fixes

* Fix record tests when using '001' marc tag.

* Implement `_prepare_blob` method for json_reader to use the model
  field names when using a JSON input.

* Fix model inheritance when overriding fields.

* Fix validation when using models and override fields.

* Enhance `creation_date` field definition.

* PEP8 fixes.

Signed-off-by: Esteban J. G. Gabancho <egabancho@gmail.com>
jsonalchemy: model resolver fix

Signed-off-by: Esteban J. G. Gabancho <egabancho@gmail.com>
Analysis: Deposit form creation [unfinished]
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