Bug#618525: please add p.d.o and .dsc links for more suites

[John Morrissey <jwm@horde.net>]

Package: qa.debian.org
Severity: wishlist
Tags: patch

.dsc and p.d.o links for more/all suites would be useful.

The attached patch:

- adds .dsc links for security, -p-u, and the new -updates.
- adds p.d.o links for security updates (p.d.o doesn't seem to have -p-u
  and -updates data)
- removes volatile support in the stylesheet (afaict, it was never added to
  generate_html.sh nor sources_to_xml.py so this was cruft)

I'm not a DD so I didn't have a straightforward way to test parts of this;
hopefully I haven't missed anything serious and it's a reasonable start.

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