ticket:9101: fix identical prefix comparison vs. prefix (pre-context) matching; fix builder meta data for conditional mappings

git-svn-id: http://source.icu-project.org/repos/icu/icu/branches/markus@33790 251d0590-4201-4cf1-90de-194747b24ca1
ticket:9101: fix long-secondary-CE32 conditions; improve weight allocation, use more short weights

git-svn-id: http://source.icu-project.org/repos/icu/icu/branches/markus@33792 251d0590-4201-4cf1-90de-194747b24ca1
ticket:9101: test prefixes & contractions

git-svn-id: http://source.icu-project.org/repos/icu/icu/branches/markus@33793 251d0590-4201-4cf1-90de-194747b24ca1