use full chunks for distr and account for __RESERVED__ blocks

fixes #759

worldedit-core/src/main/java/com/boydti/fawe/beta/implementation/filter/DistrFilter.java

@@ -40,7 +40,11 @@ public class DistrFilter extends ForkedFilter<DistrFilter> {
 
     @Override
     public final void applyBlock(FilterBlock block) {
-        counter[block.getOrdinal()]++;
+        int ordinal = block.getOrdinal();
+        if (ordinal == 0) {
+            ordinal = 1;
+        }
+        counter[ordinal]++;
     }
 
     public int getTotal(ABlockMask mask) {

worldedit-core/src/main/java/com/boydti/fawe/beta/implementation/queue/ParallelQueueExtent.java

@@ -178,12 +178,12 @@ public class ParallelQueueExtent extends PassthroughExtent implements IQueueWrap
 
     @Override
     public List<Countable<BlockState>> getBlockDistributionWithData(Region region) {
-        return apply(region, new DistrFilter(), false).getDistribution();
+        return apply(region, new DistrFilter(), true).getDistribution();
     }
 
     @Override
     public List<Countable<BlockType>> getBlockDistribution(Region region) {
-        return apply(region, new DistrFilter(), false).getTypeDistribution();
+        return apply(region, new DistrFilter(), true).getTypeDistribution();
     }
 
     /**

worldedit-core/src/main/java/com/sk89q/worldedit/extent/Extent.java

@@ -421,6 +421,10 @@ public interface Extent extends InputExtent, OutputExtent {
 
         for (final BlockVector3 pt : region) {
             BlockType type = getBlock(pt).getBlockType();
+            if (type == BlockTypes.__RESERVED__) {
+                counter[1]++;
+                continue;
+            }
             counter[type.getInternalId()]++;
         }
         List<Countable<BlockType>> distribution = new ArrayList<>();
@@ -446,6 +450,13 @@ public interface Extent extends InputExtent, OutputExtent {
         for (final BlockVector3 pt : region) {
             BlockState blk = this.getBlock(pt);
             BlockType type = blk.getBlockType();
+            if (type == BlockTypes.__RESERVED__) {
+                int[] stateCounter = counter[1];
+                if (stateCounter == null) {
+                    counter[1] = stateCounter = new int[BlockTypes.AIR.getMaxStateId() + 1];
+                }
+                stateCounter[BlockTypes.AIR.getDefaultState().getInternalPropertiesId()]++;
+            }
             int[] stateCounter = counter[type.getInternalId()];
             if (stateCounter == null) {
                 counter[type.getInternalId()] = stateCounter = new int[type.getMaxStateId() + 1];

worldedit-core/src/main/java/com/sk89q/worldedit/extent/PassthroughExtent.java

@@ -22,7 +22,6 @@ import com.sk89q.worldedit.world.block.BlockType;
 
 import java.util.List;
 import java.util.Set;
-import java.util.UUID;
 import javax.annotation.Nullable;
 
 public class PassthroughExtent extends AbstractDelegateExtent {