WebStyle: SimulatedModPythonRequest port
- SimulatedModPythonRequest now uses ResponseStreamMixin from Werkzeug to simulate correct behavior of methods write and flush.
- This fixes problems with file streaming in bibdocfile.
- This also allows developers to debug legacy Invenio applications with Werkzeug debugger.
Tested-by: Tibor Simko <tibor.simko@cern.ch>