[Dune] Template parameters in doxygen

[Oliver Sander]

Dear Dune!
Please note that the latest doxygen release (1.5.5) finally has
a \tparam command to document template parameters in C++.
No need to do anything now but we should start using that
eventually when 1.5.5 becomes more widely available.

--
Oliver

-- 
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* Oliver Sander                ** email: sander at mi.fu-berlin.de        *
* Freie Universität Berlin     ** phone: + 49 (30) 838 75217           *
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