Add simulation for multiple diseases at the same time

[holtgrewe]

The output should be a TSV file with multiple diseases.

This will also require to finally hook up a CLI parser to the CLI app.

[drseb]

I thought this code is rather being used as an API than through a CLI!?

[holtgrewe]

@drseb It's now both (annotation-simulator-core is the library). I'd thought it would be nice to for one have a little driver program for trying it out and this would also allow other non-Java users to use the code.

Do you see a too high cost for maintenance?