ticket:10017: Rejected proposal to remove formatTimePeriod from C++ TimeUnitFormat.

git-svn-id: http://source.icu-project.org/repos/icu/icu/branches/tkeep@33666 251d0590-4201-4cf1-90de-194747b24ca1
ticket:10017: Add internal size method to timeperiod.

git-svn-id: http://source.icu-project.org/repos/icu/icu/branches/tkeep@33668 251d0590-4201-4cf1-90de-194747b24ca1