Clean-up of unused classes/fields/functions.
Instead of using deprecated Date.toLocaleString() we use DateFormat.format(date).
Remark about -Xlint:unchecked.
Adding and removing scenarios works - variables don't work yet.
Updated ToDo.
Merge branch 'pre-R3' into power
Roxygen comment and Rd file for sampSize function.
Moved SampleSizeDialog to org.af.gMCP.gui.power.
Created classes Group and GroupPanel for sample size calculations.
CVPanel is now a class on it's own (since it will also be shared with SampleSizeDialog).
Created common interface PDialog implemented by PowerDialog and SampleSizeDialog.
Classes Group and GroupPanel filled with life and MenuBar now calls SampleSizeDialog.
Updated authorship note of CommonJavaJars.
Clean-up sampSize function.
NCP settings are saved and loaded for PowerDialog as XML file.
Correlation matrices are saved to and loaded from XML file.
Added config method stubs to UserDefinedPanel.
Updated NEWS and TODO.