notice: add pointer to sandbox/NOTICE.txt, update copyright year
notice: add pointer to sandbox/NOTICE.txt, update copyright year

git-svn-id: c455d203a03ec41bf444183aad31e7cce55db786@1650930 13f79535-47bb-0310-9956-ffa450edef68

svn2github/commons-vfs2,svn2github/commons-vfs2,svn2github/commons-vfs2