Bugfix process (Pull request)

Doing pull request because of bugfix: - open issue on target repo - fork target repo - clone forked repo locally - write regression test that fails before bug is corrected - verify that regression test fails - fix the bug - verify that regression test pass - either comit into your repo or commit into your repo into dedicated branch (for this bugfix). Insert #xxx where xxx is number of created issue on target repo + add relevant comments (first line short summary, then longer explanation, mention regression test) - create pull request to target repo via github GUI - interact with repo owner