support --help in boost::test's auto unit test main

[Steven Robbins <smr@…>]

This is a report from Debian user "Wesley J. Landaker" <wjl@…> See ​http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=413278

When using boost::test's auto unit test capabilities, boost itself generates the main function, and accepts a bunch of different options, such as --show_progress, --build_info, etc, as detailed at: http://www.boost.org/libs/test/doc/components/utf/parameters/index.html

Unfortunately, there is no easy way to get this list of arguments from the program itself, so you always need to keep the documentation up if you want to mess with any of these options.

To make this easier, please support a --help option that simply lists the set of valid arguments. This would be convienent for users, and also would better follow standards.

[Gennadiy Rozental]

Fixed in a trunk some time ago