On IRC stefan said that he removed the detectors directory because it is
not used by the tracker templates.
He said there is no reason for the Roundup project to ship them, they
can easily be written by end-users.

Personally I think newissuecopy.py is very precious, even if it is
simple enough that advanced end-users would be able to write it on their
own.
Just changing one email address simply is more convenient than that.