ticket:7653 move LENGTHOF(array) to common, internal header

git-svn-id: http://source.icu-project.org/repos/icu/icu@36046 251d0590-4201-4cf1-90de-194747b24ca1
ticket:11006 Memory crash/corruption in for loop due to typo in the file (source/i18n/rbt_data.cpp)

git-svn-id: http://source.icu-project.org/repos/icu/icu@36047 251d0590-4201-4cf1-90de-194747b24ca1
ticket:11007 Calendar::fZone, add comment clarifying that it cannot be NULL.

git-svn-id: http://source.icu-project.org/repos/icu/icu@36048 251d0590-4201-4cf1-90de-194747b24ca1