[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

#! /bin/sh -e
#

if [ "$1" = remove -o "$1" = upgrade ]; then
  if which install-docs >/dev/null 2>&1; then
    install-docs -r cubicweb-doc
  fi
fi

#DEBHELPER#

exit 0