[devtools] make migration handler easily available from CubicWebTC through .shell() method So we are able to use shell/migration helper methods directly from test cases.

[ldap] make instance still usable if we can't contact ldap server

[change state form] set domid to avoid data conflict with other (eg edition) form

[action] set mainform=False to ensure we don't consume previously posted form validation errors

[forms] remove some deprecation warnings

backport stable

update note

[shell, testlib] return doc test results in process_script and new assertDocTestFile method on CubicWebTC

[migration] fix rqliter when some query arguments are given

[uilib] soup2xhtml uses now lxml.html.Cleaner The lxm cleaner class let you configure more easily the allowed tag elements in parsed content. Caveats: - attributes in elements are not dropped (and html layout can be broken if css classes are reused) - root tag element in snippet is buggy