* include/bits/fstream.tcc
	(basic_filebuf::_M_allocate_internal_buffer): Remove extraneous
	try/catch blocks.
	* src/localename.cc (locale::_Impl::_M_install_facet): Same.

	* docs/html/install.html: Tweak, add bits about required locales
	for the 22_locale tests when using the gnu model.

	* testsuite/27_io/istream_sentry.cc: Tweak.

From-SVN: r53423