Api update

merge request so that you can comment the code ;)

km3io/aanet.py

@@ -149,7 +149,7 @@ class AanetReader(AanetKeys):
         if data is not None:
             self._data = data
         else:
-            self._lazy_data = uproot.open(self._file_path)['E'].lazyarrays()
+            self._data = uproot.open(self._file_path)['E'].lazyarrays()
         self._events = None
         self._hits = None
         self._tracks = None
@@ -161,7 +161,7 @@ class AanetReader(AanetKeys):
 
     def __getitem__(self, item):
         return AanetReader(file_path=self._file_path,
-                           data=self._lazy_data[item])
+                           data=self._data[item])
 
     @property
     def events(self):