corrects an older JFC log file which sometimes does not contain correct event sources

$USAGE$
<inputfilename> name of the older JFC log file
<outputfilename> name of the new JFC log file to write the results into. Must not be equal to the inputfilename

Example(s):
correctOldJFC usagedata/jfc/jfclog_01.xml usagedata/jfc/jfclog_01_corrected.xml