Additional resource statuses -- these are undocumented, but returned by
the TiVo. I'm basing the names on those proposed by Kevin J. Moye and
David Blackledge.
Added redundant ContentType field, to match the behavior of TiVo-
provided servers. I can't imagine this does anything, but just in case.
Add an XML header to XML_HEADER.
Add support for the "Genres" tag, after David Blackledge. Known working
tags are "photos", "music" (either of which puts the app into the "Music
& Photos" menu), and "other" (the default).