Ignores the site setting "find_related_post_with_key" and always tries to honor the `In-Reply-To` and `References` header for emails sent to a group.
The senders email address must be included in the `To` or `CC` header of a previous email sent to the group and the `Message-ID` of that email must be included in the current email's `In-Reply-To` or `References` header.
* Works with the current column layout exported as Excel file
* Tries to fix invalid CSV when it wasn't exported from Excel
* Imports categories
* Imports topics into the correct category
* Allows skipping archived topics
* Allows skipping private topics
* Makes use of the latest features from the base importer
* Some minor fixes and documentation updates
* Make sure the category description is imported correctly
(the about topic usually had the wrong excerpt).
* Allow import scripts to mark topics as closed or archived.
* Allow import scripts to store the topic's original id.
It will be stored in topic_custom_fields as import_topic_id.
In the past we used suppress_from_homepage, it had mixed semantics
it would remove from category list if category list was on home and
unconditionally remove from latest.
New setting explicitly only removes from latest list but leaves the
category list alond
* 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
* decode html entities within code blocks
* Only import users that actually participated in the bbpress part of Wordpress; import password hashes
* create permalinks for topics
* Better handling of [code] blocks
* 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
