Split the display name and the contacts count in the header delegate

The contacts count was elided with the display name, and therefore
not displayed when the text is elided.

Also fixes a few small problems:

* The text was elided in a rect that was for some reason sometime
smaller and sometimes bigger than the available area.
* Add one point for the gray line in the bottom.
* Play a little bit with spacing, borders and size hints to make
it prettier and easier to understand.



REVIEW: 109319

FIXED-IN: 0.6.0