mummer 3.23

The reason that all these scripts or apps are being copied to libexec (not #{HOMEBREW_PREFIX}/libexec/mummer) is that this is where Samuel asked me to put the "extra" apps and scripts in the glimmer3 formula. What we don't want is a situation where each person handling a pull request has a different idea on where to copy files. Not sure where to put Foundation.pm but I suggest we check with Samuel.