This is finally done, and deployed.

Zathras, it turns out that making these changes cleanly was quite difficult even
for me. Thanks for all of your patience.

This turns out to be a rather complex changeset, now that I am trying it.

It is a code cleanup goal for 0.11.12.

We haven't heard from Zathras for awhile - It's probably best if we allow other 
contributors to get this done.

Marked: "un-assigned"

Hey Zathras,

I think we should release the 0.11.03 release on April 10, as planned. If you
can get this ready by then, great, and put it back in the milestone when you
have it going.

If not, that's okay, just update this as you make more progress.

Hey there,

How is this going? I'm setting it as "Assigned to" you.

Next step: Finish this (-:

Zathras, do you have an update? I think we want to land this and the map
improvements within the next week, so that we can spend the following week on
the map JavaScript itself.

This is getting there, says zathras. Targeting for 0.11.03.

Just adjusting assignee and keywords.

Hey zathras,

I fixed up your migrations to the point where they run. I emailed them back to you.

Let me know what the right next step is. I've fixed up your migrations so that
they run without error. What I would like to do is now return to the normal
patch review process, if you're still willing.

I think that this bug is more important than the IRC issue, so I would love to
work with you on closing this first you're interested!

I replied with your patches by private email, but note: I will not do that
again. It's too easy for me to lose patches unless you leave them on the bug
tracker. Maybe you can stick to that going forward?

If so, then I will give you more feedback on this ticket.

The current state of this is that zathras emailed some patches to me, and I
promised to review/fix them, but I haven't yet.

So I'm leaving this note on the bug tracker so it's easier for me to track this.

Marking as "later" for now. Zathras has been active on IRC lately, so hopefully
we can see this done sometime soon!

On the Dec 4 meeting, Zathras mentioned he could try doing this.

This will be fairly easy! It seems like I need to write a few bits of documentation:

* How we use migrations (and how to add one)

...maybe other things, but I'll start there.

Trivial to add fields, adapt creation script and to write an updatescript (alter
table). However not so trivial to have an idea what will do this to present code
hence this request.
db fields will be used for higher performance map display.