YDN2MD

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

       YDN2MD,yr,dy,m,d

       yr = 4 digit year (like 1988), integer scalar
       dy = day number in year (like 310), integer scalar or vector

       m = month number (1-12, e.g. 11 = Nov)
       d = day of month (like 5).
       Note: On error returns m = d = -1.

       Find the month/day of days 155 and 255 in the year 2001
       IDL> ydn2md, 2001, [155,255], m, d
         ==> m = [6,9]   & d = [4,12]        ; = June 4 and September 12

       Adapted from Johns Hopkins University/Applied Physics Laboratory
       Update to use VALUE_LOCATE,   W. Landsman    January 2001

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