Removed unneeded string array in views in favor of an int array.  Also,
implemented the solve action listener so that you can enter a puzzle and
solve it now in entry mode.  Still need to add next/previous buttons for
when multiple solutions are found.  Also, need to go back and clean up a
lot of the model code now that we do not need to give back a 2d string
array.
Added next and previous buttons for when multiple solutions are found.
Need to redraw board or change the buttons size so that when they are
added it is not weird.  Also, the buttons are there, but I am still
missing something with the action listeners.