daweek DEPRECATED

	daweek(date.i2a.r, day_of_week.i2.r)

	This routine computes the day of week for a given date.  It gives
	correct results for dates from 1901 to 2099.
	This routine is deprecated:
	1. It uses an array as input instead of a more modern struct.
	2. It has a limited range because it does not honor the full leap year
	   algorithm.
	3. Passing a properly initialized struct tm to Linux mktime would be
	   a better alternative. mktime will compute the correct day of week
	   for a wider range of years.

	date		array containing the input date as follows:
			Word		Contents
			----		--------
			 1		Years since 1900
			 2		Month (1-12)
			 3		Day (1-31)
	day_of_week	returned day of week
			(DOW_MONDAY = Monday, ..., DOW_SUNDAY = Sunday)

	This function requires the following include files:

	clib_h

	Related functions:

	clinks_to_day_of_week_c, datime, asctime_to_clinks, date_to_clinks,
	convert_compare_date_to_clinks, datime_to_clinks,
	clinks_to_date, clinks_to_datime_c, clinks_now, get_date_clinks

	C/C++ usage:

	short	date[3];
	short	day_of_week;

	daweek(date,&day_of_week);