ticket:11303: Add test to be sure that formatAndAppend does not take parameter values that are the same as appendTo.

git-svn-id: http://source.icu-project.org/repos/icu/icu@36775 251d0590-4201-4cf1-90de-194747b24ca1
ticket:11293: Added udat_formatCalendar allowing C API user to specify a calendar as a parameter.

git-svn-id: http://source.icu-project.org/repos/icu/icu@36777 251d0590-4201-4cf1-90de-194747b24ca1