NAME:
  rotvec
 PURPOSE:   (one line only)
  Rotate 3-D vectors from one coordinate system to another
 DESCRIPTION:
 CATEGORY:
  Mathematical
 CALLING SEQUENCE:
  rotvec,x,y,z,rotmat,xp,yp,zp
 INPUTS:
  x     - Cartesian x-coordinate of point.
  y     - Cartesian y-coordinate of point.
  z     - Cartesian z-coordinate of point.
  rotmat - 3x3 rotation matrix
 OPTIONAL INPUT PARAMETERS:
 KEYWORD INPUT PARAMETERS:
  REVERSE - Flag, if set performs the inverse rotation.
 OUTPUTS:
  xp - Rotated x-coordinates.
  yp - Rotated y-coordinates.
  zp - Rotated z-coordinates.
 KEYWORD OUTPUT PARAMETERS:
 COMMON BLOCKS:
 SIDE EFFECTS:
 RESTRICTIONS:
 PROCEDURE:
 MODIFICATION HISTORY:
  2011/11/29, Written by Marc W. Buie, Southwest Research Institute
                cloned from ROTATE.F written by David J. Tholen