etc/sh/vcs-ps1.sh: Fix $JOBS count•••Bug introduced in 7c3a0a4f09c81558918b66deeafa486234a73294, when
ShellCheck suggested to replace a 'grep | wc -l' combo with 'grep -c',
but when I did I mishandled the '-v' option that was there.
bin/repos: Add new working utility•••This will be the base replacement for mr(1) (A.K.A. myrepos). Instead
of having to feed what repositories to track or not manually to the
~/.mrconfig file, dynamically discover them with this new utility.