Internal hatch animation option.

Well, I'll say it
Closes #34
At least until alexustas gives me a model of ALCOR with an external
animation. :)
Add a MJRPMButton for Ascent Guidance enable.
Merge pull request #47 from MOARdV/master

Change DrawOrbit to use double precision instead of single for segments.
Gweh.
Another little condition.
Radial markers were backwards.
Avoid potential memory leaks...
Merge remote-tracking branch 'upstream/master'