removed lingering traces of the hash system

chunk.py

@@ -16,7 +16,6 @@
 import numpy
 from PIL import Image, ImageDraw, ImageEnhance, ImageOps
 import os.path
-import hashlib
 import logging
 import time
 import math
@@ -406,22 +405,6 @@ class ChunkRenderer(object):
             
         return pseudo_data
         
-    def _hash_blockarray(self):
-        """Finds a hash of the block array"""
-        if hasattr(self, "_digest"):
-            return self._digest
-        h = hashlib.md5()
-        h.update(self.level['Blocks'])
-
-        # If the render algorithm changes, change this line to re-generate all
-        # the chunks automatically:
-        h.update("1")
-
-        digest = h.hexdigest()
-        # 6 digits ought to be plenty
-        self._digest = digest[:6]
-        return self._digest
-
     def calculate_darkness(self, skylight, blocklight):
         """Takes a raw blocklight and skylight, and returns a value
         between 0.0 (fully lit) and 1.0 (fully black) that can be used as

quadtree.py

@@ -17,7 +17,6 @@ import multiprocessing
 import itertools
 import os
 import os.path
-import hashlib
 import functools
 import re
 import shutil
@@ -251,8 +250,8 @@ class QuadtreeGen(object):
             newdir = "new" + str(dirnum)
             newdirpath = getpath(newdir)
 
-            files = [str(dirnum)+"."+self.imgformat, str(dirnum)+".hash", str(dirnum)]
+            files = [str(dirnum)+"."+self.imgformat, str(dirnum)]
-            newfiles = [str(newnum)+"."+self.imgformat, str(newnum)+".hash", str(newnum)]
+            newfiles = [str(newnum)+"."+self.imgformat, str(newnum)]
 
             os.mkdir(newdirpath)
             for f, newf in zip(files, newfiles):
@@ -555,8 +554,6 @@ def render_worldtile(quadtree, chunks, colstart, colend, rowstart, rowend, path)
     If there are no chunks, this tile is not saved (if it already exists, it is
     deleted)
 
-    If the hash file already exists, it is checked against the hash of each chunk.
-
     Standard tile size has colend-colstart=2 and rowend-rowstart=4
 
     There is no return value