plussing to WQL results+solution

New syntax/capability for WQL:

{"prepend": "foo", "type": "Place"}

returns all Place cards plussed to foo, e.g.:

foo+Eugene

foo+Chicago

fpp+Fort Collins

etc.

{"append": "my current cards", "type": "User"

returns all User cards plussed to my current cards, e.g.:

John Abbe+my current cards

Jean Russell+my current cards

etc.

If the specified card is not a valid virtual card, it should still be renderable as a link or something.