Adjust "bashbrew" namespace sorting to account for more edge cases
Adjust "bashbrew" namespace sorting to account for more edge cases

In particular, our namespace changes made `bashbrew list --build-order wordpress php` work properly but `bashbrew --namespace amd64 list --build-order wordpress php` does not -- these changes adjust our sorting to take into account both the namespaced and the non-namespaced version of each tag in our library when checking the `FROM` values for sorting purposes.

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