* 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.