[repository] ldap-feed source. Closes #2086984 datafeed based source which copy a subtree of the ldap directory into the system database. Authentication still go through ldap though. Pros: * don't need temporary tables and such for multi-sources RQL queries execution * much more flexible to enhance / configure behaviour (you simply have to replace the parser) * run better when ldap isn't reachable Cons: * no more 'on the fly' discovery of users (though a user authenticating itself will be automatically added if it doesn't exist in the db yet) * synchronization may be heavy if there are a lot of users A new cw.server.ldaputils containing code in common between former ldapuser and new ldapfeed sources has been introduced. Also ldapuser source now uses url instead of custom host/protocol option so it looks like a datafeed source (could be improved).

Whats new in CubicWeb 3.15
==========================


API changes
-----------



Unintrusive API changes
-----------------------

* new 'ldapfeed' source type, designed to replace 'ldapuser' source with
  data-feed (i.e. copy based) source ideas.


RQL
---



User interface changes
----------------------



Configuration
-------------

Base schema changes
-------------------
Email address 'read' permission is now more restrictive: only managers and
users to which an address belong may see them. Application that wish other
settings should set them explicitly.