Revision 612

Creation of the 'articles' section in the DDP with some new content,
including:
- "Counting Potatoes" (English and Spanish) presented in DWN
- "A Presentation of the Debian Proyect" (in Spanish, English version
already made but needs to be translated from RTF to Docbook)
- "Debian tools for internationalisation" (in Spanish)
- "Interfaces to Package management" (in Spanish)

Pending:
- write a common Makefile for debiandoc/docbook publishing
(distinguishing between Xml  and sgml)
- translated into english the articles
- integrate with the existing DDP manuals layout and publishing in the web
site