Features for Ventana DGH GUI Ver 2.2

1.  Change colors of temp readouts to match pH probes:

	T1 = green
	T2 = red
	T3 = blue.

2.  Default temp probe for pH2 should be T2.

3.  Text window that displays name of logging file does not clear when you change the logging file; it appends the new pathname instead, so that after 2 or 3 file changes, the path and file name are not visible.

4.  While the current GUI header displays "Ventana DGH GUI Ver 2.1" the log-file says "Version: 1.1"; in version 2.2, both should say version 2.2.