update the INSTALL_RPATH at the beginning instead of setting a new one, allows to give additional paths by hand

Add CHAMELEON_SIMULATION_MAGMA option to select whether to enable magma kernels or not in simulation mode

add a priority scheme for getrf_nopiv_tile (with dmdas) and an efficient restriction optimization (tested on sirocco)

give the full path to smpicc - refix the problem of starpu mpi function detection - with the complete path of mpi libraries the test fails... with -L/... and -l it succeeds

does not build with starpu/simgrid if symbols starpu_mpi_cache_flush and starpu_mpi_cache_flush_all_data

refix the problem of starpu mpi function detection - with the complete path of mpi libraries the test fails... with -L/... and -l it succeeds

trailing whitespaces