Recursively convert dictionary in DotDict

Everybody love DotDict because we are lazy. This PR recursively converts all dict into DotDict not only top level.

So you can do:

my_super.nested.data.scheme = 42

pystencils/utils.py

@@ -14,6 +14,13 @@ class DotDict(dict):
     __setattr__ = dict.__setitem__
     __delattr__ = dict.__delitem__
 
+    # Recursively make DotDict: https://stackoverflow.com/questions/13520421/recursive-dotdict
+    def __init__(self, dct={}):
+        for key, value in dct.items():
+            if isinstance(value, dict):
+                value = DotDict(value)
+            self[key] = value
+
 
 def all_equal(iterator):
     iterator = iter(iterator)