Many minor hotfix issued from the mixed precision branch

• Fix integration issues in C++ code (Discovered with Exageostat)
• Fix complex SPD matrix generation with latms
• Add RUNTIME_handle_to_tile() function to convert a runtime pointer to the associated CHAM_tile structure when needed outside chameleon
• Add CHAMELEON_GetContext() function to get the context in order to create its own algorithms outside chameleon.
• Fix registration of tiles with the mixed type
• Fix error message in fixdbl parameter function

changed milestone to %Chameleon 1.3.0

added Bug Feature StarPU labels

requested review from @fpruvost

assigned to @faverge

added 1 commit

• 8e38a1af - testings: replace new random by testing_ialea

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resolved all threads

mentioned in commit c8e31c62

merged