2009-07-21  Paolo Carlini  <paolo.carlini@oracle.com>

	* include/std/chrono (duration<>::operator%=,  operator%):
	Add, per DR 934.
	* testsuite/20_util/duration/arithmetic/dr934-1.cc: New.
	* testsuite/20_util/duration/arithmetic/dr934-2.cc: Likewise.

	* include/std/chrono (operator/): Simplify implementation.

From-SVN: r149856