Fix issues on new_testing

Try to fix issues reported by @furmento

• Enable the possibility to give both gemm and [sdcz]gemm as operator
• Add the operation option in the .in files
• Fix issue when calling ./dnew-testing -h
• Move CHAMELEON_My_Mpi_Rank() as deprecated in profit of CHAMELEON_Comm_rank()
• Add the missing -l --niter option to set the number of iteration of each test.
• Fix issue with the conversions rules that were not converting alpha/beta parameters, as well as read/print functions