Export to matrix market file format #116
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This PR allows to write a Trilinos matrix (eventually distributed) to a Matrix Market format file. It relies on an Epetra I/O utility, see http://docs.trilinos.org/dev/packages/epetraext/doc/html/namespaceEpetraExt.html#ab0877287bad416bde52f5456ba72d50d for a description. A simple test has been added.
@luca-heltai We can use this to export our matrices ($P_l$ and $A$ ) and plug them into other solvers.