Change property names to be "subjects"

km3io/reader.py

@@ -128,14 +128,14 @@ class AanetReader:
         return self._valid_keys
 
     @property
-    def get_hits_keys(self):
+    def hits_keys(self):
         if self._hits_keys is None:
             hits_tree = self.data['Evt']['hits']
             self._hits_keys = [key.decode('utf8') for key in hits_tree.keys()]
         return self._hits_keys
 
     @property
-    def get_tracks_keys(self):
+    def tracks_keys(self):
         if self._tracks_keys is None:
             tracks_tree = self.data['Evt']['trks']
             self._tracks_keys = [