Matt Mackall <mpm@selenic.com> [Fri, 01 Dec 2006 01:28:19 -0600] rev 3738
use ui buffering in changeset printer
delete old uibuffer class
delete old stringio class
move show to _show
add new show that uses ui.pushbuffer to buffer
add new flush that writes buffered data
add props arg to changeset_printer to match _templater