HPCC-8914 Implemennt NOXPATH flag on OUTPUT

Also fixes the #option ('removeXpathFromOutput')

Signed-off-by: Gavin Halliday <gavin.halliday@lexisnexis.com>
Merge pull request #4290 from ghalliday/issue8914

HPCC-8914 Implemennt NOXPATH flag on OUTPUT

Reviewed-By: Richard Chapman <rchapman@hpccsystems.com>