Base fixities are incomplete

[ndmitchell]

Following on from #393 I found the following missing fixies:

$>
<$!>
<>
<|

The script I wrote to grab the list was woefully incomplete, missing a bunch that are already in the list, so someone might want to take a shot at doing it properly - but adding these is probably sufficient for now.

[ndmitchell]

Concretely I'm missing anything that is a class member, since Haddock --hoogle misrenders those.