Files with same file name are not processed again

[hoelzer]

See #2

It seems that due to .unique() to prevent the watcher from running the same FASTA file multiple times now files with the exact same file name are not processed again.

This is not a major issue bc/ in a real application this should not happen often, but we should be aware of this.

Example: when the workflow is running and a.fasta is copied to the send folder, the genome is processed. Then, when a.fasta is deleted and copied again to send the workflow does not process it again.