setup-stage: Optionally reconfigure topic stage
setup-stage: Optionally reconfigure topic stage

When the topic stage has already been configured present the current
configuration and prompt for optional reconfiguration.  While at it,
make the topic stage remote name configurable by the project.

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le/VTK,KitwareMedical/ITKTubeTK,cjh1/mongochemweb-avogadrolibs,msmolens/VTK,InsightSoftwareConsortium/SimpleITK,essamjoubori/geojs,InsightSoftwareConsortium/ITKExamples,OSEHRA-Sandbox/VistA,OSEHRA/VistA,ghutchis/avogadroapp,KitwareMedical/ITKTubeTK,josephsnyder/VistA,josephsnyder/VistA,sumedhasingla/TubeTK,shabiel/VistA