[Dune] [#396] please add "BCRSMatrix += Scalar" operator

[Dune]

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The following task has a new comment added:

FS#396 - please add "BCRSMatrix += Scalar" operator
User who did this - Andreas Dedner (dedner)

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It ssems to me that any combination of a scalar with a matrix 
is not a good idea - the only exception is zero. Matrices as groups and
only have a zero element. Diagonal matrices are a ring and have a unit
matrix. To be able to assign, add, subtract a multiple of the unit matrix
to any diagonal matrix is reasonable. To assign the zero matrix to any
matrix is required. Does anybody assign a pi to all entries of a matrix is
an application?
I think we should remove all methods taking a scalar from the matrix classes
they only confuse. Then we can think of reaonable ways of assigning zero or
the unit matrix...
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