Re-use functionality from HSSFWorkbook in dev-tools to find the
dir-entry-name to make special names like WORKBOOK or BOOK work, handle
a special case in ExternalNameRecord when the flag states that there is
data, but no data remains in the stream, slightly improve error-output
in DirectoryNode, adjust all dev-tools-tests to not report stack-traces
any more for expected failures and try with HSSFWorkbook to decide if it
is an expected failure or now.

git-svn-id: https://svn.apache.org/repos/asf/poi/trunk@1536062 13f79535-47bb-0310-9956-ffa450edef68