optimisation
Merge remote-tracking branch 'origin/master'

Conflicts:
	res/all.slc
	sokoban/Board.java
	solutionEvaluator/SolutionEvaluator.java
Merge remote-tracking branch 'origin/master'

Conflicts:
	res/all.slc
	sokoban/Board.java
	solutionEvaluator/SolutionEvaluator.java