[patch] - Packaging guideline documentation update

[Pierre-Antoine Rault]

Hello guix,

Attached is a patch with basic explaination most of you know by heart, 
but that may not be obvious for newbies (like me). The details provided 
to the doc and hacking file both cover packaging and how to avoid the 
main pitfalls I've encountered myself recently. Most of them are based 
on advice from Dave, Mark_weaver (on #guix), these slides: 
http://www.gnu.org/software/guix/guix-ghm-andreas-20130823.pdf and these 
commands
http://lists.gnu.org/archive/html/guix-devel/2013-12/msg00079.html

What do you think ? Are there things to add ? (of course there are !)

First patch here ; any advice ?

- rigelk

0001-doc-Updated-packaging-guidelines.patch
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