[doc] clean ITreeAdapter documentation

cleanup

remove useless import

use is_instance in a number of places (esp. documentation) rather than the deprecated implements

[new components] fix dumb name error

remove some deprecated stuff about relation definition

backport stable

[book] more about has_<action>_permission and enhance a bit security definition section

update documentation to follow 6142:8bc6eac1fac1 changes. Try to make it better and move most doc with code on the way

cwconfig module already used by another autodocstring. Drop this currently useless file

more cwctl api update and fixes

[c-c create] argument inversed accidentally

merge

[session] cleanup hook / operation / entity edition api Operation api ~~~~~~~~~~~~~ * commit_event killed, recently introduced postcommit_event is enough and has a better name * kill SingleOperation class, it's a) currently never used b) superseeded by set_operation if needed. Entity edition api ~~~~~~~~~~~~~~~~~~ edited_attributes turned into a special object holding edition specific attributes: - attributes to be edited (simply mirrored in cw_attr_cache, actual values are there) - former _cw_skip_security set (cw_edited) and querier_pending_relations It has also been renamed to `cw_edited` on the way (it may also contains inlined relations) The entity dict interface has been deprecated. One should explicitly use either cw_attr_cache or cw_edited according to the need. Also, there is now a control that we don't try to hi-jack edited attributes once this has no more effect (eg modification have already been saved) At last, _cw_set_defaults/cw_check internal methods have been moved to this special object Hook api ~~~~~~~~ hook.entity_oldnewvalue function now moved to a method of cw_edited object.