Alternate sorting for PCI-SPH runSort step

runSort.java

public int runSort(){
  	// get values out of buffer
		Pointer<Integer> particleInd = _particleIndex.read(_queue);
		_queue.finish();
		
		int[] particleIndex = new int[_particleCount * 2]; 
		  
		// copy to array of primitives
		for(int i = 0;i< _particleCount*2;i++){
			particleIndex[i] = particleInd.get(i);
		}
		
		// quicksort
		Arrays.sort(particleIndex);
		
		// copy back to OpenCL type
		for(int i = 0;i< _particleCount*2;i++){
			System.out.println(particleIndex[i]);
			particleInd.set(i, particleIndex[i]);
		}
		
		// put results back
		_particleIndex.write(_queue, particleInd, true);
		_queue.finish();
		
		return 0;
	}