API access added to the MISP statistics providing [additional statistics](https://www.circl.lu/doc/misp/automation/index.html#additional-statistics) regarding information on contributions by organisation, attributes used and tags. The API can be also used by monitoring tools to monitor the state of a MISP instance.
An advanced correlation mechanic has been added to support new extended correlations. The new experimental feature can be enabled to correlate on CIDR network blocks.
Bugs were fixed, especially on the database indexing level (significant improvement in the indexer algorithm) as well as various other improvements that were included.