mumi CLI now supports tagging

[Arun Isaac]

Hi,

With the latest mumi 0.5.0, the mumi CLI now supports tagging and easy
composition[1] of command emails to the debbugs control server.

For example, to tag the current issue with the confirmed and easy tags:
mumi command -t +confirmed -t +easy

To remove the moreinfo tag and add the help tag:
mumi command -t -moreinfo -t +help

As always, you can search for issues with one or more tags with queries
like:
python tag:easy
gnu tag:help

These search queries work the same in the https://issues.guix.gnu.org
web UI and in the mumi CLI.

In other news, the mumi web UI now has an improved listing of issues.
Dates are now human-friendly relative dates instead of absolute
timestamps.

Regards,
Arun

[1]: Just as with `mumi compose', you need to have set up your machine
     to open mailto links in your mail client.