Add a version command for just-mr itself

Both, just and the launcher just-mr are developped and released
together and hence share version numbers. Nevertheless, the tools
are used independently. In fact, just-mr has an option to specify
the just binary to be used. Hence it is useful that each tool is
aware of its own version number. As a launcher, just-mr is supposed
to forward all subcommands known to just, hence the just-mr command
to show the version information cannot be called "version"; we use
"mrversion" instead.

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