[Openstreetmap] deagging interface

[SteveC]

Hello

For that 'Google Maps' feel, dig:

http://www.openstreetmap.org/edit/view-map2.html

With much thanks to Tom Carden and Mikel Maron for help, and Anselm Hook
for the base implementation.

Known bugs:

* doesn't know if you're logged in or not
* tile server can sometimes throw tiles back which have less than 2
  layers (should be 2: landsat and streets)
* mouse release outside the div doesn't forget to drag
* Safari just falls over for some reason


Please try and break/fix it and if nothing major comes up this will be
the new front page to the site.

have fun,

SteveC steve at asklater.com http://www.asklater.com/steve/