[Dune] [#1020] Add Specialization for DiagonalMatrix<K, 1>, that can behave like a scalar (Attachment added)

[Dune]

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User who did this - Uli Sack (usack) 

Attached to Project - Dune
Summary - Add Specialization for DiagonalMatrix<K,1>, that can behave like a scalar
Task Type - Feature Request
Category - ISTL
Status - Unconfirmed
Assigned To - 
Operating System - Unspecified / All
Severity - Low
Priority - Normal
Reported Version - SVN (pre2.2)
Due in Version - Undecided
Due Date - Undecided
Details - For FieldMatrix<K,1,1> there exists a specialization that allows to use it as a scalar of type K. DiagonalMatrix lacks this specialization and therefore this ability.
Find a patch attached that introduces such a specialization.

Note that it inherits from FieldMatrix<K,1,1>. To avoid function calls I acted on _data directly whence I needed to make _data protected instead of private in FieldMatrix<K,1,1>. If that doesn't find the developers taste I can change from this->_data to (*this)[0].

One or more files have been attached.

More information can be found at the following URL:
http://www.dune-project.org/flyspray/index.php?do=details&task_id=1020

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