Questions about subject replacement have come up twice recently in mutt-users, and Michael has expressed support for the principle, so I'm resending this patch to the -dev list for review.
Patch 1: refactors the regex replacement used by spam matching into a more abstract replacement mechanism, REPLACE_LIST Patch 2: adds subject replacement based on the new REPLACE_LIST type Patch 3: adds mailbox name replacement Documentation is now included, new since previous patch versions.
