[development] comments as nodes

[Earnie Boyd]

Quoting David Strauss <david at fourkitchens.com>:

> Unfortunately, treating comments as nodes in response to nodes makes the
> database optimizations particularly difficult for the tracker. It's not
> impossible to make it run fast, but treating comments as special kinds
> of nodes takes much elegance out of the design.
>

I didn't envision ``treating comments as special kinds of nodes''.  
Rather I envision treating comments as any other node w.r.t. the 
content API.  Tracking content by content type should be a normal thing 
to do.  One parent node to many child node relationships should be a 
normal thing to do.

Earnie