[Bug-wget] feature suggestion: host spanning depth limit (absolute)

[Naxa]

I suggest a feature for limiting the recursion depth level specifically
on different Hosts, when spanning hosts.
This way I wouldn't need to know and list the different hosts when,
for example, a page links to multiple image hosting sites.
An option like `-H 1` would then limit host spanning the same way that
`--limit` works for all recursion.  Would count the needed spanning
steps from the original domain as the distance.