[ldapfeed] re-enable ldap tests for python 3.7 This was disabled because ldap3<2 wasn't compatible with python 3.7 While I'm here, drop unseless newline.

[ldapfeed] make code compatible with ldap3>=2 * Some constants have been renamed. * Directly bind when data-cnx-dn/data-cnx-password are provided, some servers, including ours require this. * Use raise_exceptions=True to avoid ignored ldap errors * raise in case of failed anonymous bind * do not search for "dn" attribute because this raise an "invalid attribute" with new ldap3 versions * Password is now returned as bytes, so no longer need to encode them before crypt. * modification_date is now returned as a datetime object Co-Authored-By: Philippe Pepiot <philippe.pepiot@logilab.fr> Closes #16073071

[ldapfeed] use LDAP_SCOPES to find user-scope We already have LDAP_SCOPES dict defining possible scopes, this avoid possible code injection from config... Thus we can drop global variables already defined in LDAP_SCOPES since they are not used directly anymore.

[ldapfeed] drop now useless import from __future__

[rdf] Add a basic foaf adapter for CWUser By the way, use RDFLib namespaces

[rdf] add functions and tools to generate rdf graph

[pyramid, predicate] Add a predicate that matches if the pattern is an eid in the DB

[server.querier] construct ExecutionPlan from schema since querier is not needed

[server.querier] remove useless attribute Querier._planner

[server.querier] remove useless indirection Querier.rqlannotator

[server.querier] remove useless indirections ExecutionPlan.{syssource,rqlhelper,schema} Simpler is better.

[server.rqlannotation] rename SQLGenAnnotator to RQLAnnotator This class is in charge of annotating the RQL syntax tree with various bits of information, like (in)variance, use of full-text-index, etc. It is a needed step before the generation of SQL, but does not touch SQL directly. Hence RQLAnnotator seems a better name.

[server] drop system_source_cnx for a simpler internal API system_source_cnx() can be replaced with source_cnx(). If system_source_cnx() is called with dbms_system_base=False, it is strictly equivalent to calling source_cnx() with the same source, privileges and interactivity. If system_source_cnx() is called with dbms_system_base=True, it is equivalent to calling source_cnx() with the system database and the same source, privileges and interactivity. No use of the default value for 'special_privs' was found in the code.

[server/sources/native] refactor to remove useless injection

[cwvreg] rename CWRegistryStore.solutions to compute_var_types solutions() seems an obscure name to me. Since this method computes the types of the variables of the RQL query string, let us rename it to compute_var_types.

[doc] replace python with python3 in shell commands

[adapters] move class EntityAdapter from cubicweb.view to cubicweb.entity The adapter mechanism is not specific to the use of views. Moving the class the cubicweb.entity makes this clearer.

[doc] replace tabs with spaces (and make linter happy)

[setup] add rdflib-jsonld to dependencies for cubicweb[rdf]

Added tag 3.26.15, debian/3.26.15-1 for changeset fe9bd0e937e4

[pkg] version 3.26.15

[web/views] Backport changeset be63e0fd43d0 (it is a fix) in 3.26

[utils] Add the possibility to add elements in the head of an UStringIO list

[doc] replace python with python3 in shell commands