[webrequest] introduce an alternative implementation using the repoapi
DBAPI specific parts of ``CubicWebRequestBase`` are extracted in a
``DBAPICubicWebRequestBase`` decicated class and a new
``ConnectionCubicWebRequestBase`` is introduced that provide the same services
but using a repoapi.ClientConnection as data source. For now the
``DBAPICubicWebRequestBase`` is still used by default.
\.svn
^build$
^dist$
\.pyc$
\.pyo$
\.bak$
\.old$
\~$
\#.*?\#$
\.swp$
^doc/book/en/apidoc$
\.old$
syntax: regexp
.*/data/database/.*\.sqlite
.*/data/database/.*\.config
.*/data/database/tmpdb.*
.*/data/ldapdb/.*
^doc/html/
^doc/doctrees/
^doc/book/en/devweb/js_api/