* Wrapped -> Templated in cases when there is no thing to be wrapped
* cachable templates out of cachable pieces which can be reused
* auto-generation of cache keys for cachable content
* c.render_style used to propagate current style to children
* cut down on the number of c and g variables in thing templates.
* buttons in printable.html now in printablebuttons.html with handler classes in r2.lib.pages.things (planned destination of add_props).