Changes
1.11.1999 : first beta version 0.9
            Thank you all sent your seggestions and proposals for
            inprovement

1.6.2000  : v 1.0:
           -two data files can be displayed simultaneously
           -new line with the comment added to the data file, it's extension
	             changed -> 'SMC'
	   -several bugs fixed

1.10.2001 : v 1.1:
	   -actual WSR value (depending on the mouse position) is displayed
           -frequency for every displayed impedance is shown