This commit constitutes a breaking change to old configurations.
All behaviour.* options have now become general.*, with the following
few renames as exceptions:
- editor_command -> editor
- backlog_helper -> pager
- backlog_helper_strip_formatting -> pager_strip_formatting
I'm not entirely sure, but it looks like some people might not like
jokes about the Holocaust.
On a more serious note, the project has become more serious over
the 7 or so years of its existence.
