[test] improve windmill integration, new test on relation edition
Changes:
- display traceback in case of failure
- add new use test for relation edition
- edition mode is now possible by toggling `edit_test` or with using "pytest -i"
- install firebug extension in edition mode
- update documentation
# copyright %(year)s %(author)s, all rights reserved.
# contact %(author-web-site)s -- mailto:%(author-email)s
#
%(long-license)s
"""%(distname)s views/forms/actions/components for web ui"""