In (S)uper (D)uper mode, use A+J/K for page up/down

Note that more specific definitions must precede less specific
definitions [1]. For example, the definition for VI_J+VK_OPTION must
precede the definition for VI_J, in order for *both* definitions to
work.

[1]: http://pqrs.org/macosx/keyremap4macbook/xml-basic.html.en#order
Consolidate docs at top of item definition