[testlib] #345052 and #344207: major test lib refactoring/cleanup + update usage

backport some changesets to the stable branch

merge

R propagate registry API changes

R [registry] changes in the API

branching stable

[debug] cnx commit/rollback on DBG_RQL

DBG_MS flag

reconnect without argument reconnect all sources

[session pool] dont check closed session when calling set_pool from super_session

[ms] proper reset cache on external source

[config] new with_recommends option to expand_cubes

[vreg] explicit reset, no need to reload appobjects module on reloading because of schema changes

fix reloading, new .reset prototype

R refactor backup and use tar.gz to store all sources

merge

B [web.box] fix EditRelationBoxTemplate in case neither related nor unrelated

[server caching] should set cache before call to after_add_entity hooks

[web test] fix unittest form

[startup] fix syntax error

merge

B add missing selector on view registry

merge

Added tag cubicweb-debian-version-3.4.2-1 for changeset e6a8cd8cc910

Added tag cubicweb-version-3.4.2 for changeset cfcc7f6121d6

F [registry views] add _registry startup view

cleanup docstring, add actually used method to the ITree interface

3.4.2

[schema migration] test reproducing pb when deleting a relation definition with mandatory card and without removing the associated rtype + fix

reactivate verification hooks in migration test, it may hide some actual errors

[c-c] fix confirm

[bw compat] restore format_constraint into schema file context

[schema] oops

[schema changes] check entity is not being deleted and get only actually modified attributes

[migration] use new default argument, default_is_yes has never been there...

[migration] mh.confirm support a new default argument, fix default handling for ASK

use makedirs, some old instances don't have parent directory properly set

restore backward compat, still imported a lot

no need for lib_directory

3.4.1...

remove code unused for a while now

typo

delete relations one by one to avoid too complex rql analysis

to make cw schemas importable, they have to be installed w/ cw code, not in /usr/share/cubicweb/schemas

fix syntax error

backport stable

param is now trcomment_format

backport stable branch