* Document: Added load_from_data().
* App_WithDoc: Added open_document_from_data().
These can be used when the document's data is not received via
a URI. For instance, over the network via a special protocol.
(Murray Cumming)
* Build: Don't require gnome-vfs on Windows (for the MIME type),
to simplify the build, and make some other fixes for the Windows
build.
(Armin Burgmeier)
