Rebase of pure_python_reftools

Rebase of ``pure_python_reftools`` branch as ``eoxserver/services/gml/`` and ``eoxserver/services/ows/wps/`` folders were completely missing from its git tree. This caused a strange error; if switching to pure_python_reftools after running the server from the master branch, everything looked OK, because python used the *.pyc files with no corresponding *.py present. Using another python version (build) however stops immediately, saying, _incompatible bytecode_ as they can't be regenerated. I did a `git rebase -i remotes/eoxserver_origin/wps_10` for pure_python_reftools.