Added `regulations` and `directive` options to `document_type` VDEX vocabulary.

(cherry picked from commit d24e9bb63586815dbb6b3b359bbad3c2e9c5956d)
Fix setting default for `preserved_as_paper` for mails in upgrade step.

`preserved_as_paper` has a schema level default that causes
hasattr(aq_base(mail), 'preserved_as_paper' to be True even though
the mail doesn't have a value for that field. This caused the value
from the default value adapter (registry) not to be set.

(cherry picked from commit 846086a47f84ef3675d6d6d597b157ae30d6681b)
Merge pull request #505 from 4teamwork/lg-backport-dev-feedback-changes2

Backport changes based on 2nd feedback from DEV system