Fixing the non-use of default values in OptionGroups
Fixing the non-use of default values in OptionGroups

weisslj/cpp-argparse,dm0/cpp-argparse,weisslj/cpp-argparse,dm0/cpp-argparse,weisslj/cpp-argparse,weisslj/cpp-optparse,weisslj/cpp-optparse,weisslj/cpp-optparse,dm0/cpp-argparse