dpkg-query --search output with aliases

[Simon Richter <sjr@debian.org>]

Hi,

in my branch with aliasing support I have:

    root@lime:~# dpkg -S /bin/ls
    coreutils: /bin/ls
    root@lime:~# dpkg -S /usr/bin/ls
    coreutils: /usr/bin/ls

This should be mostly compatible with existing uses for files because it 
outputs the expected file name and a list of packages that claim this 
file name as a comma-separated list.

I'm unsure about:

1. what should I output when (potentially inconsistent) diversions exist 
for aliases of the queried name?
2. should there be alternate modes ("ignore aliases", "output registered 
instead of queried file name")?

   Simon

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