Interface ectrans with GPU backend #252
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When the feature "ECTRANS_GPU" is enabled, atlas will now offload all possible spectral transforms to ectrans with GPU backend.
Note that as of now not all functionality is implemented, and a not-implemented exception will be thrown.
The unit-tests by default ignore the not implemented features, triggered by such exception.
The workings of the exception handling depends on a ectrans pull request: ecmwf-ifs/ectrans#193
Without the ectrans pull requests the tests will compile but abort/crash at run-time.