Improve dataset/source info and remove duplication

- There are 2 _FlyBase Controlled Vocabulary dataset_ with no entities associated. Deleted it from datasets.xml?

- _GO_ and _The Gene Ontology_ are probably the same. To merge those, add in project.xml the properties dataset (and datasource) and set the same of the values in datasets.xml. For example _The Gene Ontology_ (_The Gene Ontology Consortium_)

- _GO Annotation data set_ and _GO Annotation for Drosophila melanogaster_ are probably the same. In this converter dataset/source are hardcoded. The only way to merge is using the same values in datasets.xml. Use _GO Annotation data set_ and _GO Annotation_ in the datasets.xml.

- _Human gene identifiers_ and _NCBI Entrez Gene identifiers_ are probably the same.
In this converter dataset/source are hardcoded. The only way to merge is using the same values
Use _NCBI Entrez Gene identifiers_ and _NCBI_ in the datasets.xml

- _NCBI PubMed to gene mapping_ and _PubMed to gene mapping_ are probably the same. In this converter dataset/source are hardcoded. The only way to merge is using the same values
Use _PubMed to gene mapping_ and _NCBI_ in the datasets.xml

- _Sequence Ontology_ and _The Sequence Ontology_ are probablye the same. To merge those, add in project.xml the properties dataset and datasource and set the same of the values in datasets.xml

- _UniProt data set_ and _Uniprot data set_ are probalby the same. Case sensitive, use Uni**P**rot data set and Uni**P**rot in the datasets.xml

- _WormBase gene identifiers_ and _Wormbase gene identifiers_ are probaby the same. Case sensitive, use _Worm**B**ase gene identifiers_ and _Worm**B**ase_ in the datasets.xml

- _miRBase Targets_ and _microRNA Targets_ are probably the same. To merge those, set in the project.xml gff3.dataSetTitle and gff3.dataSourceName to be the same of the values in datasets.xml