This commit refactors `sur/hood.hoon` and changes the signature of the
`+vats` generator thus:
```hoon
|= $: [now=@da eny=@uvJ bec=beak]
$@(~ [?(%suspended %running %blocking %nonexistent) ~])
$: verb=?
show-suspended=?
show-running=?
show-blocking=?
show-nonexistent=?
==
==
```
Called with a single positional argument, `+vats` will show only those
desks fitting the description given, while keyword parameters allow
finer-grained control over which desks are described. The `verb`
parameter determines whether the full load of desk information be shown,
or a subset thereof.
Resolves#6297.
