_DerType -> DerivativeType as underscore-followed-by-caps is a reserved identifier

Alexander Karatarakisrequested to merge
alexkaratarakis/eigen:autodiff_scalar_reserved_identifier into master

There is a public typedef called DerType, which is likely why this template parameter had an underscore. Rename the template parameter as it is not used externally.

Edited by Alexander Karatarakis

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