Add key-bindings to copy stuff

I regularly  used C-x  C-f M-n C-SPC  C-a C-w C-g  to get  the current
buffer's filename in the kill-ring  (and the clipboard).  This had two
issues:

1. It does not work with Ivy:  C-a only moves back to the beginning of
   the basename;

2. M-n  runs the find-file-at-point machinery;  if point is on  a word
   that  looks   like  a  domain   (ends  with  ".com",   ".net",  …),
   ffap *attempts to contact the  domain*, which is inconvenient for a
   bunch of reasons (locks up the  editor, leaks data by sending it in
   DNS requests, opens 9/tcp connections to random domains…)

The latter can be  disabled by customizing ffap-machine-p-known; maybe
I'll go ahead and do that someday.  In the meantime, defining a proper
function instead of relying on side-effects seems like a quick-win.

my/kill-ring-pipe-region allows me to quickly run pandoc on a Markdown
snippet and paste the resulting HTML  in LWN's comment form.  I'm sure
I will find other uses for it.

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