Add jquery.flot
member activity_scores: use flot instead of 3d

For now render only a very simple year-resolution chart.

Signed-off-by: Imre Deak <imre.deak@intel.com>
Fix semsi calling conventions
Calculate MP age
Move feed item template to its own file
Remove some currently unused elements from templates
Work around a UI bug in topic details page
Make main color pliisumpi
Adapt the number of most active MPs shown to the page width
Topic list sorting and grouping by activity