removed assert for targetVersionNumber of a Link in test_synapseutils.py:test_copy() because targetVersionNumber is no longer always set
removed assert for targetVersionNumber of a Link in test_synapseutils.py:test_copy() because targetVersionNumber is no longer always set

larssono/synapsePythonClient,zimingd/synapsePythonClient,thomasyu888/synapsePythonClient