sirikata/sirikata PPA needs more space

I was trying to upload a new version of Sirikata to be built (to the sirikata/sirikata PPA), but it was rejected because the PPA is overfull. We have very large orig packages because we include a large dependency (patched browser) which we can't satisfy from a separate package, as well as some other dependencies that aren't packaged.

We actually don't care about keeping old .orig packages around, but we can't directly manage them, so we'll run into problems like this one. Can we either allocate a bit more space so we won't be blocked from triggering a build, or, is there a way to force some of the old data to be removed?