WIP: Feature/discreteglobalbasisfunction derivative

Mainly extends DiscreteGlobalBasisFunction by derivative functionality. This contains (and in its current state requires) !186 (merged). This is an alternative approach to !57 (closed).

Has:

• This allows for localFunction(derivative(aDBGF)) as well as derivative(localFunction(aDGBF))
• This assumes that the NodeToRangeEntry can be used for the Jacobians as well.
• The necessary specializations to make the existing discreteglobalbasisfunctiontest compile.
• Provides wrap_own_share which is an unmarked copy of code introduced by @carsten.graeser elsewhere.

Lacks:

• I have not considered interactions with DifferentiableFunction
• I have not written any dedicated test (unlike !57 (closed)).