[PATCH] Add echo command

[Kevin J. McCarthy]

As a simple version like this is pretty easy to implement, it seems very
likely I am not the first person to suggest or even send in a patch
about this.

However, I've wanted this feature myself.  Sometimes I space out and am
unsure which macro I've just typed, and it would be nice to be able to
print a message afterwards.

If this is controversial I'll hold off on this patch until after 1.10.0,
but if no one has an objection I'd like to sneak it in.  So please drop
an email by Friday if you think this is a bad idea.

Thanks!

-- 
Kevin J. McCarthy
GPG Fingerprint: 8975 A9B3 3AA3 7910 385C  5308 ADEF 7684 8031 6BDA
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