Revert "Use private HTTP caches; better than not caching at all, but not as useful as allowing public caches for anonymous users."
Revert "Use private HTTP caches; better than not caching at all, but not as useful as allowing public caches for anonymous users."

This reverts commit r4170.

I don't have time to do the whole caching fun at the moment, so I'll just revert this.

git-svn-id: d0e296eae3c99886147898d36662a67893ae90b2@4172 653ae4dd-d31e-0410-96ef-6bf7bf53c507

dragonmantank/Habari,dragonmantank/Habari,dragonmantank/Habari