Change 'representatives' to 'commons' when searching for the house

The was resulting in not finding a bunch of MPs where the constituency
was ambiguous when clicking on their link, e.g. if you browsed to
Representatives and then clicked on Tanya Plibersek it wouldn't find
the MP page. This commit fixes that.
Remove unused argument

It looks like it was intended that load.pl would be able to run what's
actually in calc_caches.php but it doesn't at the moment.

It would be good if we could get it to in the future because then you
wouldn't need to remember to run two commands to update the database.
Create a file we can add to cron to be run every day
Revert "Create a file we can add to cron to be run every day"

This reverts commit f440e816a14808b95e017e2d935cd84a89bc545f.

There's already stuff for this in the `build` directory, I guess we
should adapt that.