Remove unsafe copy functions from client

Please remove features that copy Synapse objects in ways that do not preserve access restrictions on the original object.

For example, the copy function in the synapseutils module: https://github.com/Sage-Bionetworks/synapsePythonClient/blob/master/synapseutils/copy.py#L90

This function allows users to copy entities recursively when access restrictions are attached to the original but does not (and because of permissions cannot) create the AR on a destination. It allows duplicates data in Synapse. Including it in a supported client misleads external users who may be inclined to use it.

this change should address the Governance concerns for maintaining access restrictions.