Add search field to prods/groups/parties/users/board pages

[homeworkprod]

When I'm looking for a certain release or user, I intentionally go to the respective list.

It would be great if a search field for the pre-selected type of object would be right there instead of having to go from there to the search page and select the type again.

[Gargaj]

How would this look, visually?

[homeworkprod]

Well, basically like this:

But preferably better integrated into/aligned with its surroundings. Maybe not on a separate line, but next to the big multi-selection box. Or even providing the ability to optionally search in those selections, merging the search term field into that form.