clean scientificNames and taxonRank

[LienReyserhove]

Some severe inspection is required for the scientific names and taxon ranks.
A quick scan using the GBIF nameparser reveals that almost 1800 scientific names could not be (partially) parsed, which gives an indication of nomenclatural issues. These include:

type	records
CANDIDATUS	1
CULTIVAR	16
DOUBTFUL	59
HYBRID	56
INFORMAL	40
SCIENTIFIC	1627

Especially the nomenclatural issues of the type = scientific should be inspected carefully.

I will publish the information now as it is integrated in the dataset.
Afterwards, we can take the time to inspect the data more in-dept.