documentation update: How to convert from 3.0 (quilt) to 1.0 + quilt

[Gerfried Fuchs <rhonda@deb.at>]

	Hi!

 Stirred up by the recent discussion (and some IRC discussion yesterday
too) I documented a clean way how to convert from 3.0 (quilt) to
1.0 + quilt:
<http://backports.org/dokuwiki/doku.php?id=contribute#best_practice>

 Hope this helps and reduces the confusion in the future. If there are
still questions open along these lines, please let me know.

 Have fun!
Rhonda