This is a big commit see below

add removeDuplicates method to remove duplicates from String arrays
add getDimensions method
refactor rollen into a String array (this is good because now we don't
need a setRollen Method anymore)
add variables to check how long it takes for the GUI to load
remove WindowsOne.java and put its code into the buttonNewField action
listener (we might want to consider creating a method for displaying
JOptionPanes)
rename buttonOk to buttonStart, buttonNext to buttonOptimize (I have not
changed the labels.xml files yet)
when calling buttonNewField/buttonRemove/buttonStart dispose old window
instead of hiding it
put readCSV call in a separate thread to speed up GUI loading
minor fixes