PSK31SBW Version updates

1998/12/26 1.0
1998/12/31 1.01 Improved .HLP; F1 now toggles BPSK<>QPSK.
1999/01/05 1.02 With waterfall display; HELP search added.
1999/01/09 1.03 Bigger waterfall; 11025,0 fixed; COM port defaults NONE;
                More HELP screens.
1999/01/26 1.04 Added input over-range indicator. Better sample-rate
                set-up. Even more help screens.
1999/02/5  1.05 Centre freq. fixed. File-send cleaned up. Windows NT fixed.
		F3/F4 swapped. Sample-rate 11025,8000,N*500 OK.
1999/04/15 1.06 Better QPSK receive (soft-decision Viterbi). Squelch
                with signal/noise. Fast AFC with squelch pull-in.
1999/06/28 1.07 .INI file option (slasho=TRUE) to display zero as slash-O