Merged requested to merge mohr/petsc into master
- The classes' print function now accepts a second optional argument of type PetscViewerFormat. Any valid format is possible, as this will just be passed on to PETSc. Default value is PETSC_VIEWER_ASCII_MATRIXMARKET.
- The exportOperator() function now requires the format as an argument; it now also lives in the petsc namespace.
- The exportOperatorMatrix app allows to select either MATRIXMARKET or MATLAB format on the command-line.