Added TxHub servers

Added entries for ome-dev-txhub[12].cc.ksu.edu to config.
Added en3 to status line

Added IP address from en3 to status line in order to show Lightning Ethernet
adapter. Increased left side status width to allow for additional address.
Removed homegrown number setup, added number.

New version of Vim (7.3.1115) allows for both relativenumber and number to be
set. When both are set you get an absolute number on the current line and
relative numbers elsewhere.