[Dune] [#564] Use dynamic polymorphism

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FS#564 - Use dynamic polymorphism
User who did this - Carsten Gräser (Carsten)

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This reflects my proposal. 'Til now I missed the fact that the static->dynamic wrapper (point 3.) can also be done generically. Taking this into acount both approaches are almost equivalent with the following exceptions:

1) A dynamic->static wrapper can not produce the interpolate() template if it's not there additionally to the virtual method (1:0 for static approach)
2) (Non-wrapped) Dynamic polymorphism lead to much more readable/understandable code and error messages. (1:1)
3) The virtual interpolate() does not cost to much (???)
4) Virtual functions get optimized away (???)

For me even 2) alone is a very good argument and 2)+3) are enough to switch to dynamic polymorphism.

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