Hacking in a change in SRS for bbox.  This is using a list of about 4k EPSG projections in json format from the server.  Got as far as the UI parts including the autocomplete and selecting a new proj.  Next up is actually adding the proj4js def on the fly and then updating the formating of the UI output based on the new projection.
better label for the autocomplete.
left justify the labels since the projected output label will be variable length and it looks better
Getting the proj stuff to work.