[schema] consider ETYPE_NAME_MAP when deserializing specialization relations

fix the fix

fix missing import in web.request

backport stable

[migration] when some inlined relation definition is added to an entity type which has some specialized types, it should be propagated to those types else they may miss the necessary table column to store the relation

[migration] dont crash if a group doesn't exists (it may not exists yet)

[migration] fix rename_entity_type bug: not putting eids of relation deleted using sql query may cause later error on commit, complaining on missing relation on an entity which has been actually deleted

[migration] fix crash when adding symmetric relation type

[db-create] fix bug introduced by 6060:353bec342e2a (we ask for user while in non verbose mode)

[session] should be _cw, not req

[primary] use a new rtypevid flag in primary view display controller, allowing to tell the view for a non final relation should be called as an attribute view (eg, not on the target rset)

[cwprops] fix callable vocabulary of cwproperties which were inconsistently called. No more argument, should now simply return a list of (untranslated) values