rfa 0.5.9

A port ERFA to Rust.
Documentation 
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use crate::rfam::*;

pub fn anpm(a: f64)->f64
/*
**  - - - - - - - -
**   e r a A n p m
**  - - - - - - - -
**
**  Normalize angle into the range -pi <= a < +pi.
**
**  Given:
**     a        double     angle (radians)
**
**  Returned (function value):
**              double     angle in range +/-pi
**
**  This revision:  2021 May 11
**
**  Copyright (C) 2013-2021, NumFOCUS Foundation.
**  Derived, with permission, from the SOFA library.  See notes at end of file.
*/
{


   let mut w = a % URSA_D2PI;
   if w.abs() >= URSA_DPI{w -= ursa_dsign(URSA_D2PI, a);}

   return w;

/* Finished. */

}