ScaLAPACK: fix a TypeError during error message formatting

'depgrp' is a tuple that should be printed, but it was interpreted as a
tuple of arguments.
Merge pull request #149 from gribozavr/scalapack_deps_error_message

ScaLAPACK: fix a TypeError during error message formatting
Merge branch 'develop' of github.com:hpcugent/easybuild-easyblocks into develop
Merge branch 'develop' into hardcoded_blas_libs