Support `ls` on files about dbxcli HOT 3 CLOSED

I'll take a stab at this if you don't mind! I've been looking for more Go projects to contribute to, and I find this tool amazingly useful.

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Thanks @waits, go for it!

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Looks like the Dropbox API is generating that error; it doesn't allow a list_folder action to be performed on files. Unless you want to change the API, I think the best option would be to follow up on that error with a call to get_metadata on the filename and print that response data. As far as I can see get_metadata returns the same fields as list_folder (but only for one file), so the output would be the same.

There will obviously be a performance hit from making two requests, but I don't see a way around that with the current API. It'll only affect these (probably uncommon) ls-on-filename calls, anyways, so I don't think that will be a huge problem.

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