manual delegation to any user as an option

[Thomas Monjalon]

Hi,

I would like to talk about the following commit:
	Allow assigning of any user as delegate
	https://github.com/getpatchwork/patchwork/commit/e0fd7cd91a5

It can result to a very large list of people in the drop down.
It is cool that we can use a kind of autocomplete to find someone,
but it would be better if it was alphabetically sorted.

I also wonder if people really want to appear publicly in this list.
That's why I think it would even better to have an opt-in per-user.

Finally some projects may choose to make things simpler and classify
patches only automatically or to maintainers (the old behaviour).
For those projects, a global option to enable/disable user delegation
would be great.

Thanks