fail on timeout displays stack of stuck thread (Issue #727)
improvements suggested by David Saff
improvements suggested by dsaff, and added self-test
fixed logic of self-test
style improvements
Check for stuck threads now must be enabled in a Rule
added note that feature is experimental
restored settings files to try to make git happy
restored .gitignore to make git happy
Merge pull request #742 from adam-beneschan/master

#727 Fail on timeout displays stack of stuck thread