Use built in sort indicator of ListView control (on windows), wx doesn't provide this, so we do some Win32 programming.

This requires that we ev.Skip() EVT_MOTION, otherwise the list becomes very sluggish to update.

Angles are always doubles.
Internally use radians as much as possible.

 * sin, cos, tan (radians)
 * sin_deg, cos_deg, tan_deg (degrees)
 * exp, log (base e), log10
 * sqrt, pow

fixed vector subscript out of range error in the Graph control: stacked bar charts ::findItem used incorrect bound

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Added quotes and - operator, which are the most important ones

Yay for single line changes :)

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