PAMPAC actions: make it possible to perform for more than one result/match?

[johann-petrak]

Currently a fixed result or match needs to get specified, but sometimes it would be useful to perform the action for all results, all matches, or a selection of results and/or matches if they exist.

Maybe the easiest way to specify this would be to use None as the result/match index, indicating that the action should get performed for all results or matches.

[johann-petrak]

Already works for AddAnn but should be implemented in the same way for the other actions.

[johann-petrak]

Also it should be possible to run a getter for different results/matches when several actions are run.