[cubicweb/doc] Replace dc_type() by cw_etype dc_type() is may be translated. Leading to terrible terrible damage.

[dataimport] backout 6947201033be (related to #2788402) (and add a try: except to cache the intended error) The problem actually comes from the ``MassiveObjectStore`` in the ``dataio`` cube, so it should be corrected there. Here, we only protect it with a ``RuntimeWarning`` so that the user can see the problem. ``value`` is set to ``None`` (whence to ``NULL`` from a database standpoint), so that the data can be nevertheless inserted in the database. However, only the keys present in ``row`` are actually non-'``NULL``'. The real solution is to work out the issue in ``MassiveObjectStore`` directly. The current try/except should only be a temporary hack.

merge default heads

[c-c serverctl] import locally to speed up c-c

[facet js] minor refactoring and cleanups * extract facetCheckBoxSelect and facetCheckBoxUnselect * use $ as prefix for jQuery variable (facet -> $facet) * other minor rephrasing

[ldapfeed] Add support for LDAP groups (closes #2528116) Groups from the LDAP server are imported as CWGourp entities, and in_group relationships are created between existing CWUsers and CWGroups Unit tests have been refactored a bit, especially ti add helper methods to manage LDAP database.

[test/ldap] small improvement to ldapfeed unit tests better group testing and further testing of imported user life cycle.