RECPOL

       Convert 2-d rectangular coordinates to polar coordinates.

       recpol, x, y, r, a

       x, y = vector in rectangular form.           in

         /DEGREES means angle is in degrees, else radians.

       r, a = vector in polar form: radius, angle.  out

       R. Sterner. 18 Aug, 1986.
       Johns Hopkins University Applied Physics Laboratory.
       RES 13 Feb, 1991 --- added /degrees.
       R. Sterner, 30 Dec, 1991 --- simplified.
       R. Sterner, 25 May, 1993 --- Fixed atan (0,0) problem.
 Copyright (C) 1986, Johns Hopkins University/Applied Physics Laboratory
 This software may be used, copied, or redistributed as long as it is not
 sold and this copyright notice is reproduced on each copy made.  This
 routine is provided as is without any express or implied warranties
 whatsoever.  Other limitations apply as described in the file disclaimer.txt.
       Converted to IDL V5.0   W. Landsman   September 1997

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