[Dune] Interface addition

[Carsten Gräser]

Dear Dune,
I'd like to add helper template ExtendedTuple to prepend or append a type
to a tuple to tupleutility.hh. It provides the types:

ExtendedTuple<tuple<T1,...,TN>,T>::prepended  ==  tuple<T,T1,...,TN>
ExtendedTuple<tuple<T1,...,TN>,T>::appended   ==  tuple<T1,...,TN,T>

Any objections to add this utility template in the attached patch?

Best,
Carsten

-- 
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Carsten Gräser           | phone: +49-30 / 838-75349
Freie Universität Berlin | fax  : +49-30 / 838-54977
Institut für Mathematik  | email: graeser at math.fu-berlin.de
Arnimallee 6             |
14195 Berlin, Germany    | URL  : http://page.mi.fu-berlin.de/graeser
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