Some code was pasted twice in src/api.lisp, and a defstruct with no slots
isn't spelled the way I did in previous patches. We use a defstruct with no
slots for defining a hierarchy on which to dispatch our pretty-print
function.
Understanding the timings requires not only the number of rows copied into
each table but also how many bytes that represent. We add that information
now in tht output.
The number of bytes presented is computed from the unicode representation we
prepare in pgloader for each row before sending it down to PostgreSQL.
Use a generic function protocol in order to implement the human readable,
verbose, csv, copy and json reporting output formats. This is much cleaner
and extensible than the previous way.
Use that new power to implement a real JSON output from the internal state
object.
