Restructure the implementation to avoid the need to specialize member

templates, which does not work on some compilers.

* new 'to_internal' function which takes a vector.
* new 'common_command_line_parser' class.


[SVN r23054]

libs/program_options

@@ -1 +1 @@
-Subproject commit 7d546f5e5ea487b424eb00296880179405c120a1
+Subproject commit b441ebab916071992011d75d9d0e46a5a1817e0c