Rationalise what is shown in the profile popup vs profile page

[rossng]

Benjamin's original comment:

Is there really any reason for the "Show Profile" button on a profile pop-over? Seems like just the same information is shown. (Ed: The profile popover probably displays too much info atm -- or the profile page doesn't show enough. E.g. the profile page should show a list of the author's items!)

[rossng]

Split from #75