rfa 0.5.9

A port ERFA to Rust.
Documentation 
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///  Zero a p-vector.
///
///  Returned:
///     p        double[3]      zero p-vector
///
///  This revision:  2021 May 11
pub fn zp(p: &mut [f64; 3]){ p[0] =0.0; p[1] =0.0; p[2] =0.0;}
///  Zero a pv-vector.
///
///  Returned:
///     pv       double[2][3]      zero pv-vector
///
///  Called:
///     eraZp        zero p-vector
///
///  This revision:  2021 May 11
pub fn zpv(pv: &mut [[f64; 3]; 2]){zp(&mut pv[0]); zp(&mut pv[1]);}
///  Initialize an r-matrix to the null matrix.
///
///  Returned:
///     r        double[3][3]    r-matrix
///
///  This revision:  2021 May 11
pub fn zr(r: &mut [[f64; 3]; 3]){zp(&mut r[0]); zp(&mut r[1]); zp(&mut r[2]);}