On to CS3

I've made the chlsc command much faster now. But it is still very slow. (I'll release it soon.)

Meanwhile, I've been thinking a lot about cookies and have come to realize that there is a lot that needs doing before I start working on cookies--I want to move some session data out to the various URLs and POSTs. This way you can still have more than one browser window open, each with its own context. It also means that you can use the browser back button except after a post. (And that is a big benifit.)

So I'm pushing cookies et al into G3.