a few words about media types
I added a note to the README about dealing with media types other than
application/x-blorb. They seem to spring up on GNOME 2 when you
associate programs with files that don't fit a pre-existing MIME type,
i.e., blorbs on a freshly installed system. I may yet add some of
those extra types to "blorb.xml" and to the GConf schemas, but I'm
reluctant to spam the MIME database with a multiplicity of types,
especially since the more restrictive GNOME 3 seems not to allow for
them.