4.18 Release Notes

[djbrooke]

We're getting closer to releasing 4.18. The main focus of this release will be supporting previews on the file page (#3758), but we'll add in a bunch of other good stuff as well. :)

https://github.com/IQSS/dataverse/tree/6287-4.18-release-notes

[pdurbin]

@djbrooke this database setting exists already: http://guides.dataverse.org/en/4.17/installation/config.html#mdclogpath

I do think that @qqmyers added two new settings, though.