[D] book: update backup procedures in additional tips

[cleanup] remove accidentaly commited print

[test] don't try to reset session manager during test, this leads to weird failures when running multiple tests

don't update dontcheck until everything went fine: see usage in after_update_entity, where if we got an Unauthorized at hook time, we will retry and commit time.

[test] having two eid relations is now forbiden by rql

[web test] a basic test, to be completed

[test] don't clear rtags during tests, may cause breakage with manually import appobjects modules (see unittest_tracker for instance)

[web] move workflow related uicfg stuff to the workflow module

dont get eid from entity's dict

[notification] don't create 'changes' in transaction data until actually needed

backport pending_operations on hi-jacked session, see comment

[entity] fix dumb name error on .set_relations(rel=None)

[security] don't add attribute into skip_security if already in edited_attributes, else we may accidentaly skip a desired security check

[repo entity] we have to provide a __delitem__ implementation as well, see example in the docstring