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

add a simple nested buffering scheme to ui

make manifest friendlier switch to using context code ..which uses first parent by default show file hashes only with debug switch show permissions with verbose fix up tests

Add missing test output

Fix test permission

merge: handle directory renames commit: handle new copy dirstate case correctly findcopies: keep a map of all copies found for directory logic add dirs filter check for merge:followdirs config option generate a directory move map find files that match directory move map manifestmerge: add directory rename cases applyupdates: skip actions with None file add "d" action recordupdates: add "d" action add simple directory rename test

merge: pull findcopies helpers inside, refactor checkpair to checkcopies