YMD2DN

       Convert from year, month, day to day number of year.

       dy = ymd2dn(yr,m,d)

       yr = year (like 1988).      scalar or vector
       m = month number (like 11 = Nov).   scalar or vector
       d = day of month (like 5).        scalar or vector

       dy = day number in year (like 310).  out

       Written by R. Sterner, 20 June, 1985.
       Johns Hopkins University Applied Physics Laboratory.
       RES 18 Sep, 1989 --- converted to SUN
       R. Sterner, 1997 Feb 3 --- Made work for arrays.
 Copyright (C) 1985, 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  2-Jan-1998

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