controllers/clonedb.py: Controller to call the CloneDB
Actually it is not a good idea that the client directly calls the CloneDB. Indeed some tags from the CloneDB directly refers to data on the server-side. Therefore the server can bring valuable informations. That's what we do know: the client calls a controller which calls the CloneDB. The controller then adds other information useful to the client (URL of the sample sets, name of the sample sets).