* Added an altitude hold module to the autopilot. Lock your current altitude
with "ctrl-a", "cntr-a" again will deactivate. (Also lock your current
heading with "ctrl-h", and again to deactivate.)
+* Added a terrain following module ... "ctrl-t" to activate.
+* Added an autothrottle ... "ctrl-s" to activate.
+* Fixes so that terrain tools will work in windoze.
New in 0.54
* Implimented audio envelopes so that pitch of engine changes with throttle