charliecloud
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`ch-image pull`: add `-o` to output in the given directory, bypassing storage dir
PR #1255 removed the second argument of ch-image pull. This issue is to restore that functionality by adding an argument -o foo to output the image to directory foo instead of container storage.
The non-storage destination conflicted with the build cache somehow; I don't recall why or how bad it was. Thus I'm not sure whether we should do this.
This should also address the usability error described in #1335.