More robust flcbdfWrappers, linear algebra

* Adds more tests around flcbdfWrappers communicator usage
* Also improves linear algebra norm tests
* Linear algebra tests are not designed to run in parallel yet
Yes.

On Thursday, October 2, 2014, Chris Kees <notifications@github.com> wrote:

> In src/flcbdfWrappersModule.cpp:
>
> > @@ -6986,6 +7092,7 @@ initflcbdfWrappers(void)
> >    PyFLCBDFWrappers_API[0] = (void*)(&Py_PETSC_COMM_WORLD);
> >    c_api_object = PyCObject_FromVoidPtr((void*)PyFLCBDFWrappers_API,NULL);
> >    PyModule_AddObject(m,"_C_API",c_api_object);
> > +  Py_PETSC_COMM_WORLD = MPI_COMM_NULL;
>
> Meaning you would get the correct default behavior when importing only
> flcbdfWrappers (no prior Comm.init())?
>
> —
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> <https://github.com/erdc-cm/proteus/pull/128/files#r18353082>.
>