[c-c] new server_maintenance hook, called on c-c shell / upgrade

[appobject] add version number to deprecation warning

update rql dependency

backport stable

fix migration script

[cleanup] useless try except

[source storage] refactor source sql generation and results handling to allow repository side callbacks for instance with the BytesFileSystemStorage, before this change: * fspath, _fsopen function were stored procedures executed on the database -> files had to be available both on the repository *and* the database host * we needed implementation for each handled database Now, those function are python callbacks executed when necessary on the repository side, on data comming from the database. The litle cons are: * you can't do anymore restriction on mapped attributes * you can't write queries which will return in the same rset column some mapped attributes (or not mapped the same way) / some not This seems much acceptable since: * it's much more easy to handle when you start having the db on another host than the repo * BFSS works seemlessly on any backend now * you don't bother that much about the cons (at least in the bfss case): you usually don't do any restriction on Bytes... Bonus points: BFSS is more efficient (no queries under the cover as it was done in the registered procedure) and we have a much nicer/efficient fspath implementation. IMO, that rocks :D

[bfss] fix name error

[source storage] on deletion, entity has no edited_attributes

[cleanup] rename dbms_helper to dbhelper for consistency

[entity] we also have to override dict.pop to properly maintain edited_attributes consistency

[bfss test] some minor refactoring. Test deletion + creation/update/deletion rollback

don't put hooks deleting orphan composites into the 'integrity' category, we usually want it when integrity is deactivated

[facet] allow to specify a target type on relation facets for case such as Keyword/CodeKeyword where we only targets Keyword

don't rewrite config's url during migration

le patch rql26 a été importé

backport stable

[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