Improve the output of 'pacman-list-explicit'

Package names are bold, and the package version is also shown, in bold
green.

![screenshot_2014-01-13_01 16 14](https://f.cloud.github.com/assets/1778957/1909250/1dd4a2a8-7cfc-11e3-962e-74b1009612dd.png)

Also, fix awk's field separator which used to truncate any version or package
description containing a colon.