[boost] program_options wchar_t support

Any plans on adding support for parsing wchar_t in the program_options lib? It is hard coded with std::string right now which makes it kind of useless in a program where argv is a wchar_t**. It could be templatized so that it can be based on any kind of std::basic_string. Alternatively, you could use preprocessor defines to control whether it builds for ANSI or UNICODE. This would probably be adequate for its intended use as well as less complicated to implement but I suspect it would not be portable enough for BOOST. Regards, Bryan Leppard Neotechnology Consultants Ltd.