Add the implementation of the norm of matrices associated to an spm.

• Add the implementation of the norm of matrices associated to an spm distribution in shared/distributed memory
• Fix small issues in testings/examples that were not failing in case of numerical error

added MPI label

requested review from @ramet

assigned to @faverge

added 6 commits

• 7561e546 - Add function to compute norm of vectors/matrices associated to an spm distribution
• ae6c345d - Add the implementation of the norm of matrices associated to an spm...
• 407e7a9e - checkAxb: fix the norm computation by calling the correct functions
• 1aaf0cea - examples: Make sure the returned value of checkAxB is used to fail if the numerical test fails
• 5eb0ed4a - laplacian: Fix degree of 7-point laplacian
• c6cfcc74 - tests: Make sure the tests returns EXIT_FAILURE if failed

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approved this merge request

added 1 commit

• f59e9c4f - coverity: fix hided variables

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merged

mentioned in commit a133aac1

mentioned in merge request !78 (merged)