[web] Move request handling logic into cubicweb application. (closes #2200684) We improve http status handling in the process: ``application.publish`` have been renamed to ``application.handle`` to better reflect it's roles. The request object gain a status_out attribute to convey the HTTP status of the response. WSGI and etwist code have been updated. Exception gain status attribute

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sync_schema_props_perms('CWSourceHostConfig', syncperms=False)

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sql('INSERT INTO cw_source_relation(eid_from, eid_to) '

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    'SELECT e.eid,s.cw_eid FROM entities as e, cw_CWSource as s '

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    'WHERE s.cw_name=e.source AND NOT EXISTS(SELECT 1 FROM cw_source_relation WHERE eid_from=e.eid AND eid_to=s.cw_eid)')

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commit()