Changes to places and method

This log records every change to the data and to the way we check it, newest first. An entry, once published, is never edited or removed; if one turns out to be wrong, a later entry corrects it.

Data entries cover new and updated cards, fix entries record corrections reported through the form, text entries change wording only, and method entries change how we check. A fix that concerns a single place also appears on that place's card.