[PATCH] gnu-maintenance: Add 'find-package-with-attrs' and '%package-list'.

[Nikita Karetnikov]

This patch adds a procedure to fetch information from Womb.

scheme@(guile-user)> ,use (guix gnu-maintenance)
scheme@(guile-user)> (find-package-with-attrs "guix")
$1 = ("package: guix" "logo: /software/guix/graphics/guix-logo.small.png" 
"doc-category: Sysadmin" "doc-summary: Managing installed software packages and 
versions" "doc-url: none" "gplv3-status: should-be-ok" "activity-status: 
newpkg/20121117")

(By the way, we should add 'doc-url'.)

I'd like to simplify it.  For instance, it would be great to find the
needed package using a single 'filter'.  I guess that 'fold' can be
removed too.  

Also, it should be possible to get a single attribute (e.g.,
'doc-summary'), not all of them.  I'll implement that later.

The goal is to use this procedure from 'guix import'.

0001-gnu-maintenance-Add-find-package-with-attrs-and-pack.patch
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