Entrecard changes

Well, we dropped in some changes today.

The one that everyone will notice immediately is that the spot prices have all doubled. We considered more drastic moves but our current analysis of the spending trends suggests 2x looks like about right for the economy as it stands.

For those people who have been sitting on their credits, we're sorry about the sudden devaluation, however it's not yet a stable currency so if you see a spot you'd like, my current advice is don't wait around :)

Please note that the tax rate as been increased so that sellers still receive the same amount as they did before after the buy. In other words, it hasn't got any easier to get credits (would have been somewhat self-defeating).

Other changes, some improvements on the dashboard, including a transaction history (someone requested it, and it wasn't much trouble. I hope to bring more detailed information into it at a later date), and a more advanced layout for the "Your ads" stack which helps you see when it'll show.

We also have an experimental "advertising history" on the details display page. This shows your previous adverts on the spot, what you paid, and what the result was (ie, if you were rejected). This helps you figure out where you've already displayed and whether it's worth applying again.

Feedback welcome, even if it's a line of burning torches and placards titled "Down with price rises!".

Also, we had a bug with datetime updates which means dates earlier than today on the transaction list are kinda busted. Oh well, life goes on :/

Bug fixed for people having trouble editing their entrecard, unicode error got by me, all fixed.