[Dune] FunctionSpace and DiscreteFunctions.

[Robert Kloefkorn]

Hello everybody,

Oilver and I decided to change the FunctionSpace interface so that it is 
more consistent.

The main change is the following:

 From no on a function space lives on a certain level of the grid no 
matter wether this is the leaf level or a level of the grid hierarchy.
A discrete function still belongs to only one function space.

This means that the size method of the function space class dosent get 
the level anymore, the level is stored inside the function space.
Furthermore the method dbegin and dend of the discrete function doesent 
get level too.

There are a lot of changes to make which I have already done.
I change every code line I found consisting these things.
But please all of you who are concerned by this check your implementations.

mainly the Constructor of fucntions spaces and discrete functions have 
to be adapted.

Thx

R

-- 

   Robert Klöfkorn           <robertk at mathematik.uni-freiburg.de>

   Mathematisches Institut              Tel: +49 (0) 761 203 5642
   Abt. für Angewandte Mathematik       Fax: +49 (0) 761 203 5632
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