ticket:10154: Optimized time zone historical offset iteration.

git-svn-id: http://source.icu-project.org/repos/icu/icu@33633 251d0590-4201-4cf1-90de-194747b24ca1
ticket:10017: Add test for copy constructor equality and inequality operators. Fixed NULL dereference in copy constructor.

git-svn-id: http://source.icu-project.org/repos/icu/icu@33634 251d0590-4201-4cf1-90de-194747b24ca1