Updates from the Jon and Tony show.

Updates from the Jon and Tony show.

Tony submitted:

JSBsim:
Added trimming routine, it is longitudinal & in-air only at this point
Added support for taking wind & weather data from external source
Added support for flaps.
Added independently settable pitch trim
Added alphamin and max to config file, stall modeling and warning to
follow

c172.cfg:
Flaps!
Adjusted Cmo, model should be speed stable now

FG:
Hooked up Christian's weather code, should be using it soon.
Hooked up the trimming routine.  Note that the X-15 will not trim.
  This is not a model or trimming routine deficiency, just the
  nature of the X-15
The trimming routine sets the pitch trim and and throttle at startup.
The throttle is set using Norman's code for the autothrottle so the
autothrottle is on by default.  --notrim will turn it off.
Added --vc, --mach, and --notrim switches
      (vc is airspeed in knots)
uBody, vBody, and wBody are still supported, last one entered
on the command line counts, i.e. you can set vc or mach or u,v,
and w but any combination will be ignored.