Update the formula evaluator to support XSSF style external named ranges too

git-svn-id: https://svn.apache.org/repos/asf/poi/trunk@1612133 13f79535-47bb-0310-9956-ffa450edef68
Rename missing from previous commit

git-svn-id: https://svn.apache.org/repos/asf/poi/trunk@1612140 13f79535-47bb-0310-9956-ffa450edef68