[autoform] Avoid two calls to field.process_form for the same field in some cases
when some entity is being created and data include non-inlined relations, the
values for this relation are now stored for later usage, avoiding two calls
to field's process_form method, which may be unexpected for custom fields.
This has been discovered in saem_ref#f5444b1f9770.
Reorganize imports in the test along the way.
^build$
^dist$
\.egg-info$
^.tox$
^.cache$
\.pyc$
\.pyo$
\.bak$
\.old$
\~$
\#.*?\#$
\.swp$
^doc/book/en/apidoc$
\.old$
\.pybuild
debian/python-cubicweb
debian/*.log
debian/*.substvars
debian/cubicweb-doc
debian/cubicweb
debian/files
syntax: regexp
.*/data.*/database/.*
.*/data/ldapdb/.*
.*/data/uicache/
.*/data/libpython/cubicweb_.*/i18n/.*\.po
^doc/html/
^doc/doctrees/
^doc/book/en/devweb/js_api/
^doc/_build
^doc/js_api/
test-results.xml