This will give us a basis for colouring. Also remove the Sunday prices from the table, to avoid confusion and questions when people ask why the Sunday price is different to the one they put in. This has the added bonus of making the table smaller, and doesn't really remove any relevant information for the future.
Fixes#288
Part of the large-spike / small-spike translation is swapped.
(The "small-spike" is called "四期型" because the price would increase four (四) times in the week, and "large-spike" == "三期型" because the price would increase three (三) times in the week.)
Eli Perkins