Reuse RowIndexSet in BCRSMatrix::CreateIterator

Santiago Ospina De Los Ríosrequested to merge
feature/reuse-rowindexset-in-matrix-creator-iterator into master

The BCRSMatrix with row_wise creation creates many allocations and uses very sparse memory. This leads to a relatively slow pattern creation. So this change exposes the internals of the (faster) row index set from the MatrixIndexSet class into an re-usable pattern creator for the row-wise build mode of the matrix.

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Edited by Santiago Ospina De Los Ríos

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