* Update comments.
* Add Content-Type: text/xml header (nmap-streaming.pow) only.
* Wrap the Nmap output in XML comment delimiters, *after* the XML header.
* Write to /response/body (preferred) instead of /response/stream (legacy).
* Use suffix .xml for temp files.
* Move possibly noise-generating calls outside of the block
that is sent to the /request/body.
* Add legal headers.
* Add default values for params and forms.
* Cleanup code a bit.
* Wrap nmap output in XML comments; not legal, but perhaps better than the alternative.