Still leaves the old templates around in case we want to go back on this,
as well as keeps the pure redirector service around so accesses from
things like stackbuilder don't stop working.
on the ftp server, instead of crawling the directoreis directly. This
removes the requirement to sync almost 10Gb worth of ftp site onto the
web server...
The pickle file for this is currently around 1Mb, so it's not a huge
burden on the server. If it grows larger in the future, we may want to
re-think this and split it up, or put it in a database format or something
like that.
part of the core, since it seems like it could be useful for other
kinds of objects as well in the future, but for now only the
software catalogue uses it.