Remove double paragraph in taxonomic coverage
Waterfowl -> Waterbirds
Add wintering to title
Add authors
Update keywords (similar to gull-occurrences)
Update abstract
Update rationale
Updated taxonomic coverage

* New definition
* Updated numbers
* Include top 5
* Exclude precise number of records from top 5.
Add info on Euring

See issue #14
Removed common names

Was also a remark by Koen.
Add phylum
Update geographic and temporal coverage
Update numbers
Update temporal coverage

Fixes #13
Update dataset description
Remove some sentences for additional information

Including roost sites
Update methodology

Remove additional information
Update method step description
Update project data
Add usage norms