port/thwack.h		1999/1001		Created.
		1999/1007		Remove MaxLen. Add MaxFastLen, BigLen*, Max*Decode.
		1999/1022		Increase HashLog to 12. Add Thwstats. Reduce MinDecode to 8. Format edit. Remove Thwack bit buffer.
		1999/1111		Remove unused or hidden parameters. Add unthwackadd.
		1999/1116		Remove unthwackadd.
		2001/0213		Decrease EWinBlocks.
		2001/0214		Add unthwackstate.
		2001/0527		9P2000 conversion XXX. Lost changes. Increase EWinBlocks; remove unthwackstate.
		2001/1011		Add changes lost by 9P2000.