[web] Remove unreachable and broken code

[testlib] call init_config once the config has been properly bootstraped This should be done right after repository instantiation and as such involves giving CWTC.init_config as a callback to the test database handler (which will itself gives it to the repository initialization function). This unfortunatly requires to pass the init_config method to the server.init_repository function because it has to be called after the config has been initialized (which is done in Repository.__init__) but before the migration handler is instantiated (which will call 'server_maintainance' hook, hence may require the proper config). Another way to fix this would be to change the initialization sequence, but this is another story. Closes #3749378

[devtools] even better: use a plain Connection (server-side) object for pre_setup The previous commit switched from passing a Session to a ClientConnection. This fixes unittest_ldapsource's pre_setup_database, which relied on a server-side object to get at the repo.

[devtools] pre_setup_database should take a connection object

[tests/migration] use the new connection api

[tests/undo] use the new connection api

[js/ajax] deprecate user-callback support Related to #3567793.

EditRelationMixIn: stop using user_rql_callback Add generic add_relation/delete_relation ajax functions and use those. Related to #3567793

[tests/storage] use the new connection api

[tests/security] use the new connection api

[htmlwidgets] Remove unreachable code

Remove redundant __nonzero__ methods From https://docs.python.org/2/reference/datamodel.html#specialnames : When this method is not defined, __len__() is called, if it is defined, and the object is considered true if its result is nonzero. Also helpful for an eventual migration to py3k, as __nonzero__ has been replaced with __bool__, which also defaults to looking at __len__ if undefined.

[etwist] Remove unused host_prefixed_baseurl()

[basetemplate] Remove misleading comment The <base> tag was removed in commit 8bf2337a6f3b back in 2011.

[tests/security] break lines > 100 chars

[doc/3.19] Mention [gs]et_shared_data deprecation

[hooks] internal_session -> internal_cnx (including a typo)

deprecate get/set_shared_data API Session or transaction data must be used instead. We must forward .transaction_data to web/request from which it was missing (this is indeed a _cw object API). Closes #3799036.

[migration] Stop setting session.data['rebuild-infered'] It's no longer read anywhere since fe267b7336f3 "[migration] always rebuild infered relation"

Import PIL modules from the PIL namespace to be Pillow-compatible Closes #3924726

merge two stable heads

merge 3.18.5 into 3.19 branch

merge 3.17.15 into 3.18 branch

[vreg] fix bad super call to lgc.registry.Registry() Registry() expects a debugmode parameter, ovbiously not a cubicweb config object.