Drug and Chemical target interface: 'Source' and 'References' fields

For a number of tested drug targets (aspirin, ibuprofen, mirapex, mptp) there is a remark “Source: N/A”. It is only provided for some ChEMBL targets. This information should be merged with "References".

Similarly in Chemical target interface, "Source" is rarely used. If available, this information should be merged with "References".

In the popup window for both interfaces, there is no need to provide the linked target name in the "References" column.