~~~
2019-05-09
* SerialTitle class to access the Serial Title API.
* In all search classes, add method `.get_results_size()` to return the number of matches.
* In all search classes, add boolean parameter `download` to not download the results (but get the number of matches anyways).
* In `AbstractRetrieval.authogroup`, rename field "city-group" to "city" and add new fields: "dptid", "postalcode", "addresspart".
* In `AbstractRetrieval.authorgroup`, fix bug with missing affiliation information.
* In all search classes, remove deprecated paramter `start`.