[responsive/portal] Center clock in module block
[responsive/portal] Use CSS classes for portal-clock

This will get rid of some inline CSS and enable multiple clocks on the portal.
Multiple clocks don't necessarily make sense though.
[responsive/portal] Fix validation issues in donation center
[responsive/portal] Include missing functions for forumlist module
[responsive/portal] Get rid of <table> in portal_body.html
[responsive/portal] Make new tableless layout more or less responsive

Right column is moved down below other columns if width is not sufficient.