XLS(X) -> CSV: Wrap formatted numbers in quotes if necessary

e.g. German locale uses "comma" instead of point, e.g. 1,23 instead of 1.23
so we may need to quote formatted numbers

git-svn-id: https://svn.apache.org/repos/asf/poi/trunk@1917257 13f79535-47bb-0310-9956-ffa450edef68
2 files changed