std_fstream.h (basic_fstream<>::open, [...]): Implement the resolution of DR 409 [Ready], call clear() on success.

2005-03-07  Paolo Carlini  <pcarlini@suse.de>

	* include/std/std_fstream.h (basic_fstream<>::open,
	basic_ifstream<>::open, basic_ofstream<>::open): Implement the
	resolution of DR 409 [Ready], call clear() on success.
	* docs/html/ext/howto.html: Add an entry for DR 409.
	* docs/html/faq/index.html (4_4): Clarify the new behavior.
	* testsuite/27_io/basic_ifstream/open/char/1.cc: Adjust.
	* testsuite/27_io/basic_ofstream/open/char/1.cc: Likewise.

From-SVN: r96030