Issue #37: fix TDFileSystemDirectoryNode>>removeAsChildOfFileSystemDirectoryNode: ... preparing to allow dropping off objects in the proxy strucutre (not planning on simply using STON to drop refs ... I want pure object refs to have an inderect reference)
Issue #37: solved puzzle of "how to drop off object references in proxy land?" by using a gateway node to indirectly reference object through /tmp ... the gateway node reference can be serialized .... plus series of extensions to TDFileSystemLeafNode and TDProxyLeafNode to permit a directory-like object to be proxied...