[Dune] Reverse iterators in FieldVector

[Oliver Sander]

Dear Dune!
When working on FS 438 I found the following behavior of FieldVector:
The method rbegin() returns a bidirectional iterator to the last element
of the vector.  To get to the second-to-last element you can call 
operator--.
However, the standard stl behavior is to return a reverse iterator which
needs to have operator++ called to get to the second-to-last element.

Is this nonstandard behavior intended or is it a bug that needs fixing?

yrs,
Oliver

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* Oliver Sander                ** email: sander at mi.fu-berlin.de        *
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