There's 4 things in there:
- supply the repository location in keyword substitution
- set "display original" to true for merges
- provide 3 extra format characters in substitution
- Provide a default template that has FreeBSD project format:
+ "PR:",
+ "Submitted by:",
+ "Reviewed by:",
+ "Approved by:",
+ "Obtained from:",
+ "MFC after:",
+ "Security:",