availability flag provided by Thrustcurve.org. Change serialization
process to pull current files from Thrustcurve.org using the xml api,
use the corrected data for diameter and length, and use a consistent
motor designation. Added fields to the Motor chooser - case info is a
column in the listing (replacing MotorType), the other info is in the
motor details tab. Added toggle to hide motors which are OOP.
