Merge pull request #1 from NathanKell/master

Catch up with NathanKell.
Kerbin pressureCurve
comments.
temperatureCurve.
Typo, I think?
powerCurve.
Clamping.
Resolved conflict between obsolete 400-point curve and new 200-point curve.
Merge pull request #7 from eggrobin/best-approximation-splines

Best approximation splines