Fix cubing stacks with more 933120000 pixels (#48)

* disable PIL's maximum image limit to enable cubing stacks with more than 14000**2 pixels

* fix formatting

Author: philippotto

wkcuber/image_readers.py

@@ -6,6 +6,9 @@
 from .vendor.dm3 import DM3
 from .vendor.dm4 import DM4File
 
+# Disable PIL's maximum image limit.
+Image.MAX_IMAGE_PIXELS = None
+
 
 class PillowImageReader:
     def read_array(self, file_name, dtype):