Implement a maximum embedded image size

[Tim Gould]

Hey Orion,

The scaling system does not seem to uncache its own images even when a link is changed. Which is a problem. I don't expect it to do so dynamically but reposting should make it flush its cache and redraw.

Play around here to see http://forums.ldraw.org/showthread.php?t...23#pid2123

eg. LDraw Discussion Forum should have a blue brick

Tim