ticket:10043: make an error not a crash when reading import rules fails.

git-svn-id: http://source.icu-project.org/repos/icu/icu@34622 251d0590-4201-4cf1-90de-194747b24ca1
ticket:10521: Allow tz2icu to merge supplemental zone-region mapping data. Also removed unused tz.alias.

git-svn-id: http://source.icu-project.org/repos/icu/icu@34623 251d0590-4201-4cf1-90de-194747b24ca1
ticket:10434: tzdata2013h to ICU4C

git-svn-id: http://source.icu-project.org/repos/icu/icu@34625 251d0590-4201-4cf1-90de-194747b24ca1