global: uniform the handling of names

[jacquerie]

According to the schema names:

Should be of the form 'family names, first names'
(https://github.com/inspirehep/inspire-schemas/blob/1db9777634844724c522728521ab1f876b25ca8e/inspire_schemas/records/hep.yml#L328-L339)

Logic to deal with this, either by normalizing some input we get (legacy, forms, harvesting) or producing the output other services expect (ORCID, HAL) is scattered all over the codebase. Often it is wrong. For example:

inspire-next/tests/unit/dojson/test_dojson_hep_bd9xx.py

Line 924 in c14f532

{'full_name': 'Guerra, A.Del'}, # XXX: wrong.

It should be centralized, and we should probably something semi-smart like https://pypi.python.org/pypi/nameparser to handle the parsing for us, instead of directly monkeying with strings.