[Dune] Matrix --> ISTL

[Oliver Sander]

Hi all!
I've been using the Matrix class from dune-common and I must say
I miss ISTL features every now and then.  To make it fully compliant,
though, the class would have to move into the ISTL module.  Are
there any objections to that?

--
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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