update to 2017.05.003 (ABI and API break)
    
    drop obsolete openblas patch
    re-enable OpenMPI OpenMP builds
    enable papi on supported arches
    build and ship non-MPI version (without _onenode suffix)
    provide a man-link for openmp version of elpa2_print_kernels
    execstack is now available everywhere
    include and verify GPG signature
    conditionalize running tests and disable by default as they take too long