Modified CMake and setup.py.in to generate only one swig c++ lib and use it for c++ mains and tests.

Review mesh mechanism, add/fix subsets. All tests ok except those with obstacles somewhere. Work in progress

Fix fortran install process + shared lib by default (much more verbose ...), review default method setup in operators, review fftw curl.

24 - test_opencl_environment (Failed), because of pep8
Examples not tested but NSDebug.py which works fine.

Update differential_operations and stretching (fix bug + optimizations) - Add GlobalTests (test functionnalities, perf ...)

update docs (doxy), update operators (small fixes + add operator.discrete package), add profiler option (for memory), add testPoisson, + misc ... not finished, it may work ... or not

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