Use identifiers.org shortcodes for chembl
System code Cl changes to chembl.compound - meaning it's then obvious how to also add chembl.target to datasources.txt in org.bridgedb.bio.
This change means the system codes match the identifiers.org - e.g. http://identifiers.org/chembl.compound/ and http://identifiers.org/chembl.target/ - avoiding confusion with http://identifiers.org/cl/ (Cell Type Ontology)
This fixes #16.
Would this be a breaking change?
Changing a short two letter system code to the longer identifers.org ones is extremely tempting. It does however break comparability with other BridgeDB linksets, something we have tried very hard to avoid.
Which are these other linksets? Any views, @egonw ?
@egonw : I believe this PR is very old and not relevant anymore (also because the Datasources.tsv has been moved to a different repo). Can we close it?