Unused util

[jbrockmendel]

util._doctools.TablePlotter is used only in it's own __main__ block. Does that need to exist?

_decorators.docstring_wrapper is unused.

[WillAyd]

It does appear that this is technically used in merging.rst, though the block referencing it is suppressed. That said, do we have any tools to analyze and clean up unused code? Wonder if something like vulture is worth exploring for pandas

[jreback]

we mostly just use linting

but adding a cleanup tool (to be run in the ci) would be great!

[WillAyd]

I'll open a separate change for that. Running vulture pandas --exclude pandas/tests from the top level directory yields 469 items, and I imagine there has to be some false positives in there.

If someone goes through the modules called out by the tool and can learn in more detail how the tool works it appears to be something that can get integrated with CI