Adding Signers during Processing

In order to allow new signers to payments/envelopes already in processing, the stored list of allowed users must be updated by calling the SetAuthorizedUsersRule on the affected items. Alternatively, it is also possible to disable the filter which lets signers see only the items they are allowed to sign by removing the context=singning from the signing inventory or make a second "signing emergency" inventory. Note that removing the filter will come at the cost of performance. The signer will only be able to sign items to which he has the signing rights as these are checked from configuration during signing.