Use parameters for files. Avoid WriteOnCopy errors
Use parameters for files. Avoid WriteOnCopy errors

The code was producing warnings about modifying a copy of a view,
nothing bad but I modified the code so it doesn't complains.
Use parameters instead of hard coded values for input and output
file names.

Ensembl/ensembl-analysis,Ensembl/ensembl-analysis,Ensembl/ensembl-analysis