VirMet 1.0: production ready, more user friendly

VirMet is now a full fledged python pipeline for viral metagenomics, relying on
some state-of-the-art external tools called via shell for specific
computationally intensive tasks.

It features subcommands to download, update, and index reference databases.
After these preliminary operations matching against viral database for a whole
Illumina MiSeq run is performed in a single call.
Coverage plots for specific viruses can be drawn to support or exclude their
presence.

More information are available on the documentation page.