alarm: sleep for a period of time, then be noisy.

Usage: alarm <options> <time>
Options:
	-x	Run in a separate xterm (must be FIRST argument)
		(or symlink this program to "xalarm");
	-q	X windows query for args. (must be FIRST arg).

	-m str	Use "str" as a message that names this alarm. 
	-t	The <time> is specified as a time of day, not
		an amount of time to sleep.

	-nb	no beep
	-ng	no gong

	<time>	may be of the form "HH:MM:SS" 
	    if -t is not set it is the amount of time from now to wait. If -t
	    is set it indicates a time of day. Also, if -t is set <time> may be
	    any valid GNU date string, even 'Sun Jan 31 16:28:40 UTC 1999'
Examples:

	alarm 30			# alarm in 30 secs
	alarm 30:00		# alarm in 30 mins

	alarm -x 30:00		# alarm in 30 mins in separate xterm.
	
	alarm -m "Wake Up" 15:00	# alarm with a message attached

	alarm -x -t 23:59		# one minute before midnight.
	alarm -x -t 23:59:59	# one second before midnight.

	alarm -x -t "Dec 31 23:59:59 UTC 1999"	# Y2K alarm

Notes/Hacks:
	Any words after <time> are treated as though from -m <message>
		e.g.  alarm 5:00 take five...
	If <time> starts with "t" or "d" then a digit, -t is assumed.
		e.g.  alarm t12:00 lunch break
	Ending "p" or "pm" means pm.
		e.g.  alarm t5:00p EOB
	A -w may be inserted before -x to have the process wait (i.e.
		not go into the background)