Triggering actions from outside?

[Sebastian Gniazdowski]

I thought that it would be nice to trigger CK_EditNew and other actions
when running a macro, or a usermenu entry. It can be done via signals
(USR1), attached is a patch.

For running from macros inside mc/mcedit, what's sufficient is to execute:
mc --ck EditNew (because the pid is exported). For outside, one has to
specify the pid via: MC_PID=1234 mc --ck EditNew.

It works for mc and mcedit. What do you think?

PS. A little video: asciinema.org/a/432747

-- 
Best regards,
Sebastian Gniazdowski
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