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
update URL and Source URL, switch to https
factorize build process
fix Fortran mods path (#1409235)
don't run the testsuite on ARM 32bit (takes 6.5 hours)
execstack is not available on some arches for EPEL (#1460531)
