FYI: Relying on jslib now

Howdy.  Sometimes you have to accept 1 unit of complexity to free 
yourself from 10 units of complexity.

I bit the bullet (american expression) and added a dependency on JSLIB. 
  (Gregor thinks it has been added to core moz, but if it has, it's been 
renamed and I can't find it.)  Thus, we'll require the user to first 
install:

   http://jslib.mozdev.org/

We can provide for this ourselves later.

It's amazing how many lines of JS this has eliminated.  In fact, the 
lines eliminated were pretty complex ones.  Before, I was building the 
startup RDF manually, node by node, property by property.  Now I just 
copy three boilerplate files over.

We now have a "twingle" dir in the Mozilla profile dir.  This will also 
let us add local content to the "Local Site" folder.

I haven't checked stuff in yet.  When I get to a clean stopping point, 
I'll do so.

--Paul