Add placeholder for new site
Add schema.getFull() and forceTitle()

forceTitle() does a bit more work to find a title for the schema
(although it does not guarantee one).

This is for when you *really really want* a title, like in a schema
switcher.
Fix infinite recursion bug

Recursive schemas caused it problems.
Add localStorage cleanup
Renderer improvements

Type-switcher now a <select>, and objects with more than five optional
properties have them collapsed into a <select> of possibilities.
Header code hard-wired, instead of in comment.