Blocking for partial directions

In the current implementation, it was only possible to block for all coordinates. However, for some problems it might make sense to only block one specific direction. This can now be achieved by setting unwanted coordinates to zero.

pystencils/astnodes.py

@@ -404,7 +404,7 @@ class PragmaBlock(Block):
 
 class LoopOverCoordinate(Node):
     LOOP_COUNTER_NAME_PREFIX = "ctr"
-    BlOCK_LOOP_COUNTER_NAME_PREFIX = "_blockctr"
+    BLOCK_LOOP_COUNTER_NAME_PREFIX = "_blockctr"
 
     def __init__(self, body, coordinate_to_loop_over, start, stop, step=1, is_block_loop=False):
         super(LoopOverCoordinate, self).__init__(parent=None)