corrected data types: this removes undeterministic segfaults on cpus

device/calcMergedEneGra.cl

@@ -448,12 +448,12 @@ partial_interE[get_local_id(0)] += 16777216.0f;
 		else
 		{
 			// Getting coordinates
-			int x_low  = (int)floor(x); 
-			int y_low  = (int)floor(y); 
-			int z_low  = (int)floor(z);
-			int x_high = (int)ceil(x); 
-			int y_high = (int)ceil(y); 
-			int z_high = (int)ceil(z);
+			uint x_low  = (uint)floor(x); 
+			uint y_low  = (uint)floor(y); 
+			uint z_low  = (uint)floor(z);
+			uint x_high = (uint)ceil(x); 
+			uint y_high = (uint)ceil(y); 
+			uint z_high = (uint)ceil(z);
 			float dx = x - x_low; 
 			float dy = y - y_low; 
 			float dz = z - z_low;

device/calcenergy.cl

@@ -314,12 +314,12 @@ void gpu_calc_energy(
 		else
 		{
 			// Getting coordinates
-			int x_low  = (int)floor(x); 
-			int y_low  = (int)floor(y); 
-			int z_low  = (int)floor(z);
-			int x_high = (int)ceil(x); 
-			int y_high = (int)ceil(y); 
-			int z_high = (int)ceil(z);
+			uint x_low  = (uint)floor(x); 
+			uint y_low  = (uint)floor(y); 
+			uint z_low  = (uint)floor(z);
+			uint x_high = (uint)ceil(x); 
+			uint y_high = (uint)ceil(y); 
+			uint z_high = (uint)ceil(z);
 			float dx = x - x_low; 
 			float dy = y - y_low; 
 			float dz = z - z_low;

device/calcgradient.cl

@@ -381,12 +381,12 @@ void gpu_calc_gradient(
 		else
 		{
 			// Getting coordinates
-			int x_low  = (int)floor(x); 
-			int y_low  = (int)floor(y); 
-			int z_low  = (int)floor(z);
-			int x_high = (int)ceil(x); 
-			int y_high = (int)ceil(y); 
-			int z_high = (int)ceil(z);
+			uint x_low  = (uint)floor(x); 
+			uint y_low  = (uint)floor(y); 
+			uint z_low  = (uint)floor(z);
+			uint x_high = (uint)ceil(x); 
+			uint y_high = (uint)ceil(y); 
+			uint z_high = (uint)ceil(z);
 			float dx = x - x_low; 
 			float dy = y - y_low; 
 			float dz = z - z_low;