port/log.c		1999/0316		Created.
		1999/0630		Remove unused variable.
		1999/0731		Bug fix: reversed sizes of halves of wrapped-around buffer.
		2000/1018		Add log, vlog, dynamically size Log.buf, add minimum read size.
		2001/0503		Cleanup: free cannot error.
		2002/0217		Remove vlog, convert to new fmt library.