pkg_install patches for review / testing

[Roman Neuhauser]

# eikemeier at fillmore-labs.com / 2004-05-01 14:00:31 +0200:
> This patch add the following features to the pkg_install suite of tools:
> 
> * new flags:
> 
>  -X: use extended regular expression instead of basic ones (pkg_info, 
>      pkg_delete, pkg_version) (PR 56961)

>  -E: show only matching package names and set the return code (pkg_info)
>      (PR 56961)

    Shouldn't these two be swapped to match sed, grep, etc?

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