Fleshed out "HTTP URIs are not Without Expense"

Since this dialog is playing out on several fronts and I would like
the dissenting view well-articulated, I've taken the liberty to flesh
out the (previously empty) "HTTP URIs are not Without Expense" Wiki
(http://esw.w3.org/topic/HCLS/HCLS_URI_matrix/HttpUrisAreExpensive).
I've moved it to a top level location (instead of /topic/HCLS):

http://esw.w3.org/topic/HttpUrisAreExpensive

I also included links (in context) to the URN registries finding and
the AWWW document.

-- Chimezie