Add all sets of a dataset to a process

https://redmine.teklia.com/issues/6264

Requires #1384 (closed)

We are switching from selecting datasets to selecting sets within a process. But it is a common use case to select all sets within a dataset; selecting only some of the sets came in later. We can avoid the time consuming task of adding each set one by one, and possibly missing some of them, by adding a Select all button, or a new <option>All sets</option> within the set list. This should call CreateProcessSet for each of the sets, one by one, and stop immediately if there is an error in any of the calls.