Try to make the eclipse classpath more general - place the output under /build/, remove hard coded jar source paths, re-order entries to make it easier to see what we have, and use the default JDK not a hard coded version

git-svn-id: https://svn.apache.org/repos/asf/poi/trunk@1534750 13f79535-47bb-0310-9956-ffa450edef68