* emails weren't sorted in correct order
* better default regex for splitting mbox files
* output Message-ID if email is skipped because it doesn't have a Date
* store time it took to index message in DB (to find performance issues)
* ignore listserv specific files
* better examples for split_regex
* first email in mbox shouldn't contain the split string
* always lock the DB in exclusive mode
* save email within transaction
* messages can be grouped by subject and use original order (for Listserv)
* adds option to index emails without running the import
* ignores dot-files and empty emails
* new setting to prefer HTML over plaintext emails during import
* restore original site settings at the end of import
* elided content of HTML mails was not put inside details block
* Disable journaling to improve performance in Docker
* Use the email cooking method
* Store IncomingEmail in order find related posts by Message-ID
* Escape HTML in imported messages
