got hiddenSingleSolver to run for rows. Needs to be finished for cols
and blocks.
Merge remote-tracking branch 'origin/master'

Conflicts:
	de.htwg.sa.sudoku/src/de/htwg/sudoku/solver/HiddenSingleSolver.java
Find HiddenSingle now works with Step
Merge remote-tracking branch 'origin/master'

Conflicts:
	de.htwg.sa.sudoku/src/de/htwg/sudoku/solver/HiddenSingleSolver.java
Made changes to generate menu structure