[service-api] Add unified service API on `_cw` attribute
This will allow writting generic entity code that could run on both client and
repo side.
This addition have been discussed with Sylvain Sylvain Thenault.
.. winclude:: search_sample_queries
You can as well type complex queries using the RQL_ query language,
used every where to build dynamic pages of this site.
You can use one of the following prefixes to specify which kind of search you
want:
* `rql` : RQL query
* `text` : full text search
.. _RQL: doc/tut_rql