python: drop defaults from JGF edges

Problem: the JGF reader does not check the 'directed' field of edges
and edges are assumed to be containment by default. Some space could
be saved by dropping those two fields.

Drop them.

src/python/fluxion/resourcegraph/V1.py

@@ -90,8 +90,6 @@ def __init__(self, parentId, vtxId):
         super().__init__(
             parentId,
             vtxId,
-            directed=True,
-            metadata={"subsystem": "containment"},
         )
 
 
@@ -105,7 +103,8 @@ def __init__(self, rv1):
         rv1 -- RV1 Dictorary that conforms to Flux RFC 20:
                    Resource Set Specification Version 1
         """
-        super().__init__()
+        super().__init__(directed=False)
+        # graph *is* directed, however, suppress unnecessary `"directed": true` fields
         self._uniqId = 0
         self._rv1NoSched = rv1
         self._encode()