[test] fix ldap test when executed from certain hosts

[test] missing main

restore line dropped in 6424:f443a2b8a5c7 which is necessary to have proper base-url on test server config (used for ms tests at least)

typo

[breadcrumb] infinite loop safety belt, bw compatible by hi-jacking 'recurs' argument

[login] fix some previously introduced login box css breakage

[components] refactor main template header: make it much more flexible by using CtxComponent * rename userlink class (not private) with somewhat bw compat * make some cosmetic adjustements on log-in/registration components * update to component api, though this may breaks some sub-classes (for application customizing the breadcrumbs component for instance)

[schema / sources] store data sources as cubicweb entities this implies several changes: * new CWSource / CWSourceHostConfig entity types * only the system sources and default admin login/password stored in sources file (other stuff will be ignored) * on startup, get sources definition from the database * every entities have a cw_source relation * a facet allow filtering

[hook/operation] nicer api to achieve same result as set_operation, as described in #1253630

backport stable