[tox] Reference requirements.txt for hooks environment The file existed but was not referenced.

[devtools/testlib] Remove assertions about direct usage of CubicWebTC/AutomaticWebTest The point is to be able to use a test runner other than pytest (e.g. nose2, nosetests or py.test) to run CubicWeb test suite. The issue is that most other test loaders inspects members of all base classes of test case classes to determine test methods and it hits this `config` property (actually executing it), which breaks the assertion. So just return None instead of failing. Closes #7817147.

Add ldap3 to server test requirements

[pkg] bump version number so tox won't use cw from pypi

[schema] add CubicWebRelationDefinitionSchema Stop monkeypatching yams, inherit from RelationDefinitionSchema instead.

[schema] Let RQLConstraint inherit from BaseRQLConstraint instead of RQLVocabularyConstraint There is apparently no reason for RQLConstraint to inherit from RQLVocabularyConstraint as it gets its `repo_check` method from `RepoEnforcedRQLConstraintMixIn` and RQLVocabularyConstraint (which inherits from BaseRQLConstraint) actually only overrides that method. So simplify inheritance by removing a useless level of indirection. Adjust cw_unrelated_rql accordingly, where it was that RQLConstraint inherited from RQLVocabularyConstraint.

[server] unormalize source logger's name to avoid encoding errors

[entities] parameters should be given to fire_transition, else they are simply ignored

[entity] set _cw_adapters_cache in __init__ rather than on first use

fix typos and indentation in docstrings/docs