rfa 0.5.9

A port ERFA to Rust.
Documentation 
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///  Initialize an r-matrix to the identity matrix.
///
///  Returned:
///   * r identity matrix
///
///  This revision:  2021 May 11

pub fn ir(r: &mut [[f64; 3]; 3])
{
   r[0][0] = 1.0;
   r[0][1] = 0.0;
   r[0][2] = 0.0;
   r[1][0] = 0.0;
   r[1][1] = 1.0;
   r[1][2] = 0.0;
   r[2][0] = 0.0;
   r[2][1] = 0.0;
   r[2][2] = 1.0;

/* Finished. */

}