ticket:10258: Create branch.

git-svn-id: http://source.icu-project.org/repos/icu/icu@33969 251d0590-4201-4cf1-90de-194747b24ca1
ticket:10258: Correctly match different positive and negative signs in C++ when isLenient is set.

git-svn-id: http://source.icu-project.org/repos/icu/icu@33970 251d0590-4201-4cf1-90de-194747b24ca1