add tork-runner(1) to run tests once and then exit
become remote to existing instance on socket fail

If an another instance of this tork program is already running, then
become a remote to it rather than failing on binding its socket file.
tork: show help message to clients upon connecting
tork: tell user to input 'h' key for help message
Merge branch 'other'
Merge branch 'patch'
Merge branch 'minor'
Version 19.5.0 (2013-11-30)