ticket:10547: Format -0.0 as a negative when using scientific notation.

git-svn-id: http://source.icu-project.org/repos/icu/icu/trunk@35196 251d0590-4201-4cf1-90de-194747b24ca1
ticket:10547: Remove extra code from tests added there to help me debug.

git-svn-id: http://source.icu-project.org/repos/icu/icu/trunk@35197 251d0590-4201-4cf1-90de-194747b24ca1
ticket:10601: Added UNUM_CURRENCY_ACCOUNTING to ICU4C NumberFormat.

git-svn-id: http://source.icu-project.org/repos/icu/icu/trunk@35198 251d0590-4201-4cf1-90de-194747b24ca1