Add support for the user to specify custom headers to be indexed (and
re-index these for existing messages at the next database upgrade).
-Build system
-------------
-Fix to allow a non-source-directory build. For example, the below
-should be made to work:
-
- mkdir build_dir
- cd build_dir
- ../configure
- make
+Save filenames for files detected as "not an email file" in the
+database. This would allow for two things: 1. Optimizing "notmuch new"
+to not have to look at these files again (since they are potentially
+large so the detection could be potentially slow). 2. A "notmuch
+search" syntax could be added to allow the user to find these files,
+(and perhaps delete them or move them away as appropriate).
Test suite
----------