NAME:
  newanom
 PURPOSE:   (one line only)
  Compute new mean anomaly from old given date.
 DESCRIPTION:
 CATEGORY:
  Celestial Mechanics
 CALLING SEQUENCE:
  newanom,jdepoch,m,a,newjd,newm
 INPUTS:
  jdepoch - Julian date of mean anomaly
  m       - Mean anomaly (radians)
  a       - Semi-major axis (AU)
  newjd   - Julian date of mean anomaly desired
 OPTIONAL INPUT PARAMETERS:
 KEYWORD INPUT PARAMETERS:
 OUTPUTS:
  newm    - New mean anomaly (radians)
 KEYWORD OUTPUT PARAMETERS:
 COMMON BLOCKS:
 SIDE EFFECTS:
 RESTRICTIONS:
 PROCEDURE:
 MODIFICATION HISTORY:
  2002/05/29 - Marc W. Buie, Lowell Observatory.  Ported from fortran routines
    supplied by Larry Wasserman and Ted Bowell.
  2013/08/16, MWB, modified to allow the same variable to be given for
                     input and output mean anomaly