Should we use in the CLI the same defaults of `hq`?

[giovannipizzi]

There are a few points where we change the defaults: number of backlog, and use of hyper threading.
I suggest we stick to the same defaults of HQ.

• HT used by default; have a --no-ht flag instead
• don't set the backlog by default, and specify it only if the user passes an option

(and any other change we are actually doing to the defaults).
Otherwise a user will get confused when using directly HQ vs using it via AiiDA