[form] fix validation error handling * type when possible ValidationError raised by the edit controller * don't rely on repository to check required field * turn css class used for field error message to errorMsg to avoid confusion with the error class added to input * fix css when errors are added by the form renderer * fix form renderer to add the error message

[captcha] handle captcha validation properly in the captcha widget also, avoid error if pil isn't installed (only a recommendation)

[testlib] __errorurl may be a relative path, check we're actually removing base url first

[i18ncube] clear_rtag_objects imported when generating cube's .po file

[maintainance] don't crash if we've no in-memory repository

[db dump/restore] fix '#615840: db-dump must be always runnable' by setting repairing on config. Also, avoid to read the whole schema from the database on dump/restore: the bootstrap schema is enough.

cleanup

__missing__ main

[form] put qualified name on validation error, should fix #784299

[test] fixes when executed under apycot environment (also added ldap1 to test host /etc/hosts)