Fix the copyright notice year

git-svn-id: https://svn.apache.org/repos/asf/poi/trunk@1567636 13f79535-47bb-0310-9956-ffa450edef68
disable not applicable findbugs check

git-svn-id: https://svn.apache.org/repos/asf/poi/trunk@1567815 13f79535-47bb-0310-9956-ffa450edef68