People view - thumbnail display

[hluxem]

Extend display for people view to show more than 3 columns of person thumbnails in the left panel, more information like DOB/group .. for the first two display modes.

[Jingo]

+1 for the ability to define multi-column display extensions... I was able to extend the panel to show 6 and 12 columns and it actually looks quite good and still legible so long as the panel is large enough