Bug 17909: Additional polishing

Bug 17909: Additional polishing

No spectacular things:

[1] Move the framework modifications to a sub. Use same style to create auth types and linked fields.
[2] Change some new Object occurrences to Object->new.
[3] Add tests for field count and field order in the first two subsets.
[4] Few whitespace changes (sorry) and comment lines.

Signed-off-by: Marcel de Rooy <m.de.rooy@rijksmuseum.nl>
Signed-off-by: Josef Moravec <josef.moravec@gmail.com>
Signed-off-by: Julian Maurice <julian.maurice@biblibre.com>
Signed-off-by: Mason James <mtj@kohaaloha.com>
(cherry picked from commit cac98af1f40c753d094b4f1b69a638455c31d26f)
Signed-off-by: Julian Maurice <julian.maurice@biblibre.com>