* change ticketbook data request to allow for pagination
* implemented api endpoints on nym-api side
* auxiliary nym-api queries for number of issued ticketbooks
* ensure that challenged issuers support new queries
* addeed persistent identity to the rewarder
* clippy
* stupid chrono feature workaround
* clippy
* debugging issuance verification
* remove redundant closure
* added a minimum issuance threshold
* feature: introduce /load endpoint for self-reported quantised NymNode load
* return Load::Unknown for value of 0 because it means we misread some data
* add additional filtering on 'en...' endpoints
Andrej Mihajlov