Use the nf-core module for downloading from the NCBI

[muffato]

Description of feature

There is a nf-core module named ncbigenomedownload (based on the Python package https://github.com/kblin/ncbi-genome-download) that seems able to download all the files we want given an accession number.

That would be more sustainable than the current local module.

[phani-tmp]

Hi @muffato , can you assign me this issue

[muffato]

Done, @phani-tmp. Do you want to give it a go ?

[phani-tmp]

Done, @phani-tmp. Do you want to give it a go ?

Yup