[repo] straightforward bootstrap sequence. Closes #2841188
* kill fill_schema method which was doing to much different things, in favor of
a deserialize_method which is simply reading schema from the db and returning
it
* set_schema doesn't bother with cubes
This allows to easilly follow what's going on and so to cleanup init_cnxset_pool
to get the following boostrap order:
1. load cubes (implies loading site_cubicweb)
2. load schema
3. init data sources
4. init cnx sets
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^doc/html/
^doc/doctrees/
^doc/book/en/devweb/js_api/