Remove BlockPhysics checks to determine if necessary

The costs outweigh the benefits here, I think. This is an attempt to see if the current logic, minus the BlockPhysicsEvent check, will suffice. This will eliminate the relatively expensive 6-way search for concrete powder every time a fluid block updates.

src/nu/nerd/SafeBuckets/SafeBucketsListener.java

@@ -98,26 +98,6 @@ public void onBlockFromTo(BlockFromToEvent event) {
         }
     }
 
-    // ------------------------------------------------------------------------
-    /**
-     * More flowing liquid protection.
-     */
-    @EventHandler(priority = EventPriority.HIGHEST, ignoreCancelled = true)
-    public void onBlockPhysics(BlockPhysicsEvent event) {
-        Block block = event.getBlock();
-        if (block == null) {
-            return;
-        }
-        if (block.getType() == Material.WATER || block.getType() == Material.LAVA) {
-            if (SafeBuckets.isSafe(block)) {
-                event.setCancelled(true);
-                if (block.getType() == Material.WATER) {
-                    Util.findConcretePowder(block); // see javadoc for this method
-                }
-            }
-        }
-    }
-
     // ------------------------------------------------------------------------
     /**
      * Prevents WorldEdited liquids from flowing.