MEP22 coexistence with current NavigationToolbar

Hello

What if instead of removing the NavigationToolbar stuff, we add a
rcParams['navigation'] to signal the use of the new classes insted of
the old ones?

This way we can add deprecation warnings to the old classes to smooth
the transition.

Personally I don't like the idea, this adds too many if/else patches.

Federico

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Y yo que culpa tengo de que ellas se crean todo lo que yo les digo?

-- Antonio Alducin --