2006-08-14  Paolo Carlini  <pcarlini@suse.de>

	* include/tr1/random (class poisson_distribution<>): Add.
	* include/tr1/random.tcc (poisson_distribution<>::operator(),
	operator<<(std::basic_ostream<>&, const poisson_distribution<>&),
	operator>>(std::basic_istream<>&, poisson_distribution<>&,
	poisson_distribution<>::poisson_distribution(const _RealType&)):
	Define.
	* testsuite/tr1/5_numerical_facilities/random/poisson_distribution/
	requirements/typedefs.cc: New.

	* include/tr1/random.tcc (mersenne_twister<>::operator()): Tweak
	a bit for efficiency.
	
	* include/tr1/random.tcc (operator<<(std::basic_ostream<>&,
	const normal_distribution<>&), operator>>(std::basic_istream<>&,
	normal_distribution<>&)): Do not output _M_saved unnecessarily.

	* include/tr1/random: Trivial formatting fixes.
	* include/tr1/cmath: Likewise.

From-SVN: r116149