modulecmd

• fix DefaultGroups: Undefined variable in init/csh
• the following directories are now added to CMAKE_MODULE_PATH (if they exist):
  • ${PREFIX}/lib/cmake
  • ${PREFIX}/share/cmake
  • ${PREFIX}/share/MODULENAME/cmake
• the following directories are now added to PKG_CONFIG_PATH (if they exist):
  • ${PREFIX}/lib/pkgconfig
  • ${PREFIX}/share/pkgconfig

build system

• Springdale added as RHEL clone
• under some conditions the function to search for a config/variants file returned an empty list instead of terminating the build process