PR libstdc++/28080 (partial)

PR libstdc++/28080 (partial)

2007-02-27  Paolo Carlini  <pcarlini@suse.de>

	PR libstdc++/28080 (partial)
	* include/std/bitset: Do not include <ios>, <iosfwd> is enough.
	(operator>>(std::basic_istream<>&, bitset<>&)): Tweak, refer to
	ios_base as a base of basic_istream.
	* include/std/iomanip: Do not include <ios>, <iosfwd> +
	<bits/ios_base.h> is enough.
	* include/std/iosfwd: Do not include <cctype> here...
	* include/bits/locale_facets.h: ... do it here, when needed.
	* include/bits/ostream.tcc: Clean up, do not include <locale> here...
	* include/std/ostream: ... here instead.
	* include/bits/istream.tcc: Likewise for <locale> and <ostream>...
	* include/std/istream: ... here.
	* include/bits/sstream.tcc: Do not include <sstream>.

From-SVN: r122380