complex (proj(const std::complex<>&), proj(_Tp)): Add per DR 781.

2008-05-22  Paolo Carlini  <paolo.carlini@oracle.com>

	* include/std/complex (proj(const std::complex<>&), proj(_Tp)):
	Add per DR 781.
	* include/tr1_impl/complex(polar(const _Tp&, const _Up&)): Move to...
	* include/tr1/complex: ... here.
	* doc/xml/manual/intro.xml: Add an entry for DR 781.
	* testsuite/26_numerics/complex/dr781.cc: Add.
	* acinclude.m4 ([GLIBCXX_ENABLE_C99]): Update.
	* configure: Regenerate.

From-SVN: r135757