Support readding point of order speakers

[bastianjoel]

It should be possible to readd the last speaker even if it is a point of order speaker.

Corresponding client issue: #2715

[jsangmeister]

Should it be readded as a PoOS, with the same category etc.?

[reiterl]

The action is list_of_speakers/re_add_last. It has a check for point of order in it, which leads to the ActionException.

[Elblinator]

It should be readded as a normal contribution, not as a PoO.

[jsangmeister]

The action is list_of_speakers/re_add_last. It has a check for point of order in it, which leads to the ActionException.

Yes, that should be changed so the speaker is readded as a normal speaker.

[jsangmeister]

The behaviour should be the same for PoO and non-PoO speakers: They are moved to the first position of the queue, as normal speakers. This means that for PoOS the PoO related fields must be removed.