20040613	initial version
20040614	check poll(2) for errors
20040702	SIGUSR1 activates, SIGUSER2 deactivates gpio pin
20040703	added "-I" switch
20050729	added man page
20050731	added "-r" switch to support inverted LED logic on WRAP devices
		(proposed by Johan Fredin <johan@spelaroll.se>)
		bump version number to 0.2
20060326	added "-n" switch to keep gpioflicker from permanently occupying
		the GPIO device (proposed by William MacKay <foobaz@gmail.com>)
		bump version number to 0.3

