std_sstream.h (basic_stringbuf::basic_stringbuf(string): Initialize _M_string with pointer-and-size constructor, not just pointer.

2001-07-13  Phil Edwards  <pme@sources.redhat.com>

	* include/bits/std_sstream.h (basic_stringbuf::basic_stringbuf(string):
	Initialize _M_string with pointer-and-size constructor, not just
	pointer.  Fix some comments.
	* testsuite/21_strings/ctor_copy_dtor.cc (test03):  New test.
	* testsuite/27_io/stringbuf.cc (test02):  Remove unused variable.
	(test03):  Add embedded-NUL tests.

	* mkcheck.in:  When printing totals, match the order of the tests.
	* include/bits/stringfwd.h:  Use same declaration keywords.
	* include/bits/std_iosfwd.h:  Cosmetic spacing.

From-SVN: r43996