ticket:10335: Pull in latest trunk

git-svn-id: http://source.icu-project.org/repos/icu/icu@34226 251d0590-4201-4cf1-90de-194747b24ca1
ticket:10335: Fix data errors found in exhaustive tests

git-svn-id: http://source.icu-project.org/repos/icu/icu@34228 251d0590-4201-4cf1-90de-194747b24ca1
ticket:7647: Add/use LaoBreakEngine and laodict.txt; more useful messages in gendict

git-svn-id: http://source.icu-project.org/repos/icu/icu@34229 251d0590-4201-4cf1-90de-194747b24ca1
ticket:10335: Pull in ticket 6643 from CLDR

git-svn-id: http://source.icu-project.org/repos/icu/icu@34231 251d0590-4201-4cf1-90de-194747b24ca1