Bug 56170: Fix a problem with cells in workbooks becoming disconnected from XMLBeans whenever columns need to be reordered during writing the file. This happens because setCArray() disconnects any previously stored array-item but we try to re-use them. So we need to recreate the CTCell and set it in the XSSFCell to make this work in all currently tested cases.

git-svn-id: https://svn.apache.org/repos/asf/poi/trunk@1595659 13f79535-47bb-0310-9956-ffa450edef68