journo page: Fix crash in quick-n-nasty mode

(quick-n-nasty mode is where some values are missing because they
take too long to calculate. They're normally calculated and cached
by the journo-page-builder tool. But if the cached data isn't
there then we still need to display the page as best we can)
fix donate button image offset when pressed
journo page: show num of alerts and recommendations in stats box
stats box: restore missing padding
ditch obsolete journo scoring stuff
handle old cached journo pages without $num_alerts
more tweaks to handle outdated cache
Merge pull request #1 from bcampbell/tamtweaks

Tamtweaks