matplotlib/matplotlib — pull request #1388 by efiring (2012-10-13 23:55:42+00:00)
Title: Deprecate original NavigationToolbar

There seemed to be agreement on the mailing list that we could deprecate the original NavigationToolbar in the 1.2 release. In this PR I have done the most minimal version of deprecation, that is, putting a warning in the rcParams validator.