Try to isolate uses of namespaced name strings

Add asserts to uses of `name` arguments to check that they
are not namespaced; rename namespace-able name arguments
to `ns_name` and avoid some unrelated uses of the `name`
argument that don't represent rock names (there are still
others around, to be fixed eventually).

This may cause some failures in some untested code paths
with namespaced packages, but we hope to catch them
with better testing. Better to be safe here than to
perform filesystem operations on incorrect paths.

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