I am proposing a function that takes identical parameters to
opensocial.requestNavigateTo() and returns the URL that would be
loaded, had requestNavigateTo() been called with the same parameters.
The purpose of this function would be to obtain links to user's
profiles and application canvases that could be used in activity
streams or non-opensocial container websites.
Note that this would ideally include a target OWNER id parameter, as
proposed here:
http://groups.google.com/group/opensocial-and-gadgets-spec/browse_thread/thread/718488b0ea390e73#