cwbeacon history log:

19970723 (Rev. 0.1)
	Removed:
	- some functions not used
	- random group generation of code

	Added:
	- more morse code characters (sign marks)
	- trimmed the speed and length for dot-dash generation.
	- support to make available a signal on parallel port, to key a
	  transmitter.
	- speaker sound on/off
	- time interval between transmissions

19970729 (Rev. 0.2)
	Added:
	- another signal at parallel port to switch an attenuator.
	- a sample file to be appended to user root in crontab

19970804 (Rev. 0.4)
	Added:
	- a signal tone at the end of transmission (suggested by EA4CM)
	- revised doc info.
