Clean up stdexcept.

Clean up stdexcept.

2001-02-07  Benjamin Kosnik  <bkoz@redhat.com>

	Clean up stdexcept.
	* include/bits/stringfwd.h: New file.
	* include/bits/stl_string_fwd.h: Remove.
	* include/bits/localefwd.h: Remove declaration for allocator.
	* include/bits/std_iosfwd: Same.
	* include/bits/std_string.h: Include it.
	* include/bits/std_ios.h: Remove include.
	* include/bits/basic_string.h: Tweak.
	* libsupc++/new: Format.
	* src/Makefile.am (base_headers): Add stringfwd.h, remove
	stl_string_fwd.h
	* src/Makefile.in: Regenerate.
	* include/bits/std_stdexcept.h: Rewrite.
	* src/stdexcept.cc: Same.

From-SVN: r39526