Atan calculation

Parameters:

y
x	source Y and X arrays
dst	destination array
len	length of arrays
angleInDegrees	if set to true return angles in degrees, otherwise in radians

// global functions

int
hal_ni_fastAtan32f(
    const float* y,
    const float* x,
    float* dst,
    int len,
    bool angleInDegrees
    );

int
hal_ni_fastAtan64f(
    const double* y,
    const double* x,
    double* dst,
    int len,
    bool angleInDegrees
    );