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Transformed Mass matrix preconditioner from a linear solver to a liner operator

Nathan Marín requested to merge preconditioner-operator into devel
  • I modified the toarray_struphy method, so now it does not allocate the output array if one is already given in the function parameters.
  • Transformed the Mass matrix preconditioner into a linear operator.
  • Added the method tosparse_struphy to transform linear operators into sparse matrices.
  • Added a test for tosparse_struphy

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