ticket:7881: accept a list .dat file (for -a -r -x) whose name differs from the ToC prefixes it contains

git-svn-id: http://source.icu-project.org/repos/icu/icu/trunk@33659 251d0590-4201-4cf1-90de-194747b24ca1
ticket:10128: update ICU to Unicode 6.3 beta (merge from branches/markus/uni63 at r33661)

git-svn-id: http://source.icu-project.org/repos/icu/icu/trunk@33662 251d0590-4201-4cf1-90de-194747b24ca1