[profile] Port thunknyc/profile to Orchard

[alexander-yakushev]

As another milestone in my crusade against abandonware in CIDER, orchard.profile is intended to replace https://github.com/thunknyc/profile. This is a from-scratch implementation, so not much attribution is given. I dropped the parts of the API that cider-nrepl doesn't invoke; and users don't need them either because users should use a proper profiler, not this ersatz. Still, a few people in the survey reported using cider-profile, so let them enjoy this new version.

As a way to display the results, I'm going with the new table view-mode just added to the inspector. Here's how the results will look like:

This will allow us to drop the custom *cider-profile* buffer, reuse the existing inspector machinery, give users the ability to click around, and even inspect the full list of timing samples (if anyone ever needs that).

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• You've added tests to cover your change(s)
• You've updated the changelog (if adding/changing user-visible functionality)

[bbatsov]

Impressive! I like how simple and short the new implementation is - only 188 lines!

[bbatsov]

Don't forget to mention it in the list of features in the README.