At last! - Ability to Create Namespaces that are not Enabled for Ensemble - Coming in 2017.1

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For the record,  if you subsequently want to Ensemble-enable namespace XYZ, here's the call that does it verbosely:

do ##class(%Library.EnsembleMgr).EnableNamespace("XYZ",1)

To do it quietly, omit the second argument or pass it as 0.