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the rql autocompletion was broken for a very long time, and it's a very helpful.

The rql autocomplete was using a JSONController, which has been deprecated for
very long time. In b01dd0ef43aa, JSONController has been removed, and the rql
autocompletion has been broken since.

As suggested by the deprecated warning, using the AjaxController instead is
making everything working again.

fix #215

This error happens when there is no database with the given database name.
Now there is an error message and a clean exit.

BREAKING CHANGE: cubicweb-ctl db-create no more drops the db in
auto mode.

fix #202

This fixes:

File "/usr/local/lib/python3.7/dist-packages/cubicweb/web/views/management.py", line 156, in call
    binfo = text_error_description(ex, excinfo, req, eversion, cversions)
UnboundLocalError: local variable 'eversion' referenced before assignment

This occur when self._cw.cnx is False and `submit-mail` is configured.

This change introduces a dependency to cachetools, but reinventing the wheelseems useless in the present case

This will change an exception from something like :

    psycopg2.IntegrityError: null value in column "asource" violates not-null constraint
    DETAIL:  Failing row contains (341471, CWRType, null, null).

To:

    psycopg2.IntegrityError: when doing the query 'INSERT INTO entities ( eid, type ) VALUES ( %(eid)s, %(type)s )' with the args '{'type': u'CWRType', 'eid': 341471}' got the error 'null value in column "asource" violates not-null constraint
    DETAIL:  Failing row contains (341471, CWRType, null, null).'

Tested with sqlite3 and postgresql.

fix #210
This will allow to specify a script as "defer" or "async"
Note: If a script is added twice with different attributes,
  only the first call to add this script will be taken into account

Provide a PGHelper alternative class that doesn't drop constraints nor indexes
but which it disables constraints check during the import.

Constraints are restored once the import is finished.

cubicweb-ctl is in the setup.py entrypoint

closes #206

fix #185

do not reuse artifact. They have different conditions, and lint_doc artifact
    should be kept to see the MR doc related results.

closes #206