ticket:7912 add parse/format functions, other UFormattable API improvements

git-svn-id: http://source.icu-project.org/repos/icu/icu/trunk@33894 251d0590-4201-4cf1-90de-194747b24ca1
ticket:9583: show test summary at end of make. Apropos when the trunk is broken..

git-svn-id: http://source.icu-project.org/repos/icu/icu/trunk@33895 251d0590-4201-4cf1-90de-194747b24ca1