Macsyfinder

Update references
Add some new features
Fix minor bugs

for details visit https://macsyfinder.readthedocs.io/en/latest/user_guide/new_v2.html

Creation of a Release based on 2.1 tag in order to obtain doi to comply with Peer Com J policies.

Release mentioned in the corresponding article:

MacSyFinder v2: Improved modelling and search engine to identify molecular systems in genomes.
**Néron et al.**, _Peer Community Journal_, 2023

Obtained doi: 10.5281/zenodo.7704885