Added a few options to support my digital photo frame project, info display & URG signal

I added a couple options for 'info' formatting, the ability to center it and autofit (reduce font size) when the text would otherwise be cropped.

I also added support for the URG signal to update like --reload except triggered externally

My project is a Raspberry Pi based connected digital photo frame using a surplus LCD monitor, a little more info at: http://scaryprojects.blogspot.com/2013/02/connected-digital-photo-frame.html

-Mike