p-a: consider archived bugs, too

Signed-off-by: Andreas Beckmann <anbe@debian.org>
add a Closes: as I'm reopening the bug again
Add link to the piuparts source at the top of the navigation menu on the left.
conf/crontab-master: Run generate_daily_report twice a day.
htdocs/index.tpl: announce various changes
htdocs/index.tpl: add news about gerating reports twice a day.
htdocs/index.tpl: write history: 2006 means 7, not 5, years.
htdocs/index.tpl: updated twice a day
htdocs/index.tpl: (visually) shrink about piuparts paragraph.