#229 Added LBF option for description as default text for new or empty fields

[Rod Roark]

This is a small tweak to the layout "edit options" to add the ability for the Description field to serve as default text for a new or empty field. This is mainly useful for textarea fields which can be very long.

Code may be found as the most recent commit here:

https://github.com/sunsetsystems/openemr/commits/lbfdesc