mpc-bioinformatics/ProtGraph: Release of ProtGraph v0.3.9

Fixed the dependency-nightmare. No more need for a biopython-development version. In this release we also removed Pipfile and changed to a requirements.txt. A FASTA-Parser is now included, which can generated SP-EMBL-txt entries (optionally with annotated VARIANTs if needed). This FASTA-Parser is in a very early version and will be expanded to also encode other features. A poster and a presentation was also added in materials_and_posters.