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Export missing functionality in MatrixIndexSet

Carsten Gräser requested to merge feature/export-matrixindexset-data into master

The MatrixIndexSet class provides access to an incomplete subset of its internal data. While the number of rows is exported, the number of cols and the column indices per row have been missing so far. This was an oversight, since one can hardly use the class without this, unless one relies on the dedicated exportIdx() method for BCRSMatrix.

With the missing data exported, one can now easily use MatrixIndexSet to build patterns for other sparse matrix classes.

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