More appearance updates for Lumina by default:
1) Make the clock text bold.
2) Set the default font to DejaVu Sans (embedded in Qt), and a bit bigger than regular 10 point (13 pixel), and a bit heavier font weight.

This goes very well with the larger menu icons, and makes the text on the toolbar easier to read as well. This also ensures that the entire desktop (including menus, logout window, plugins, etc..) all have a unified font (does not change external applications).
Merge branch 'master' of github.com:pcbsd/pcbsd