pick up preinstallopts when installing Python packages
fix typo
fix order of det_pylibdir call vs super call, deps need to be loaded first
set extra installation options for recent scipy versions
fix determining active compiler family
add missing super call
pass preinstallopts in test_step, set custom preinstallopts for scipy in configure step
Merge pull request #334 from boegel/python_preinstallopts

fix building of Python extensions, fix build of recent scipy versions with GCC-based toolchain