Add a "generic" option for (distributed) gemm

The summa gemm is more efficient than the original generic gemm and is enabled by default. Though, it might be interesting to have the option to easily switch to the original generic one (chameleon_dtesting -o gemm --generic). @AntJego implemented it and proposes to share it into the master.

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• 11348e0d - revert useless modif

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pipeline failed after modifying readme but it passed before : merge should still be possible

changed milestone to %Chameleon 1.2.0

added Feature Tests/CTest labels

assigned to @faverge and unassigned @agullo

Thanks @faverge once again for your careful proofreading!

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• abe75f47 - no need to check chameleon_generic here

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• 9b2bde80 - Apply 1 suggestion(s) to 1 file(s)

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approved this merge request

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enabled an automatic merge when the pipeline for 9b2bde80 succeeds

merged

mentioned in commit 9594f9af