* using exceptions instead of cerr

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can use more than one UGGrid at the same time.

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UG's internal heap.  Sucks, but there is really no way around.

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base_array

first implementation of FieldMatrix and BCRSMatrix

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Iterative Solver Template Library (sounds like something big ...)

I started with the vectors. It is not ready yet, don't use it.
Explanations follow...

Peter

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,,multiple instance'' linker errors

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* added an Interface to create a SuperMatrix
  (only available if HAVE_SUPERLU is defined... autoconf test will follow)

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