PMD report

Problems found

#FileLineProblem
1 sourceforge/mtac/gui/CalculatorPanel.java 201 Avoid unused local variables such as 'expr'
2 sourceforge/mtac/gui/HistoryModel.java 147 Avoid unused private methods such as 'addItemToEnd(String)'
3 sourceforge/mtac/gui/PlotPanel.java 468 Avoid unused local variables such as 'insets'
4 sourceforge/mtac/kernel/MTACMath.java 955 Avoid unused local variables such as 'reZ'
5 sourceforge/mtac/kernel/MTACMath.java 956 Avoid unused local variables such as 'imZ'