This is mostly ensuring use strict and use warnings are used everywhere.

This is the root of the mirror tree, so it should be easy to find in the
synchronisation tree graph.

This is already a feature of the Google map, but that's not currently working.

This API isn't working (it's outdated and there's no API key) and while
this change might actually be breaking it more, but it at least stops an
intrusive alert from showing on the page for every user.

The value actually provided is numeric, not the human-readable form.

This provides better image quality, greater speed and reduced bandwidth.