- update to version 2.10.0
  * Improve testing support on Laplacian matrices with an optional
    diagonal regularization parameter.
  * Base the implementation of VariableBlockVector on std::vector
    as the storage type. Note that this prevents from using bool
    as block type that was possible before.
  * A method BCRSMatrix::setIndicesNoSort() was added. Similar
    to BCRSMatrix::setIndices() this allows to insert all indices
    of a row at once, but - in contrast to the latter - does not
    sort them. This allows to speed up insertion if indices are
    already sorted.
  * UMFPACK is extended to arbitrary blocked matrix structures.
    This includes MultiTypeBlockMatrix. The external interface
    is unchanged.
  * The internal storage in MatrixIndexSet was changed from
    std::set to a sorted std::vector to improve performance. The
    stored index type was changed from std::size_t to uint32_t to
    reduce memory consumption and improve performance. Hence,
    MatrixIndexSet can no longer be used for very large matrices
    with more than 2^32 columns.
  * Added flag 'useFixedOrder' to the coarsen method of AMGs
    ParallelIndicesCoarsener. If set to true, during the creation
    of the coarser matrix (by accumulation and restriction
    to fewer processes) the coarse matrix rows are ordered in a
    fixed manner, making parallel runs reproducible; the runtime
    is possibly not ideal though.

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