[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
[MESSAGES CONTROL]
disable-msg = C0301
[VARIABLES]
# Enable / disable this checker
enable-variables = yes
additional-builtins = _, display_name
[BASIC]
required-attributes=
attr-rgx = (w|[a-z_][a-z0-9_]{2,30})
variable-rgx = (w|[a-z_][a-z0-9_]{2,30})$
argument-rgx = (w|[a-z_][a-z0-9_]{2,30})$
[TYPECHECK]
generated-members=debug,info,notice,warning,error,critical,exception