BUG: DataFrame.clip arguments inconsistent (close #GH 2747)

[jreback]

arguments are inconsistent to numpy and Series.clip

[ghost]

This obviously breaks back compat.
Maybe cheat and just use min(upper,lower) and max(upper,lower)?
That way both the old code and the numpy convention will work.

[jreback]

I think this SHOULD break compat, as it very self-inconsistent....how about a warning with the max/min as the test?

[ghost]

Change the args around, but use min/max anyway. fix it and keep old code working.

[jreback]

fixed

[ghost]

Changed to 0.10.2, now that it's not a breaking change.

[wesm]

Thank you guys

[wesm]

Merged. thanks