Added statements about correcting behavior in future commit

Add reference to github ticket

Fixing placement of github comment

Made test code more explicit

Fixing unrelated tests that are also throwing warnings

Updating whatsnew to give more detail about deprecation

Fixing whatsnew and breaking out tests to catch warnings

Additional comments and more concise whatsnew

Updating deprecate decorator to support custom message

DOC: Update docstrings, depr message, and whatsnew

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