convert bup to new ChunkedEncryptable API (but do not support chunking)

bup already splits files and does rolling deltas, so there is no reason to
use chunking here.

The new API made it easier to add progress support for storeKey, so that's
done. Unfortunately, bup-split still outputs its own progress with -q,
so a little ugly, but not too bad.

Made dropping remove the branch for an object, for two reasons:

1. The new API calls removeKey to roll back a storeKey when the content
   changed unexpectedly.
2. So that testremote will be happy.

Also, fixed a bug that caused a crash when removing the branch for an
object in rollback.

1 files changed, 2 insertions, 2 deletions

diff --git a/doc/design/assistant/progressbars.mdwn b/doc/design/assistant/progressbars.mdwn
index 50f424508..7de70452d 100644
--- a/doc/design/assistant/progressbars.mdwn
+++ b/doc/design/assistant/progressbars.mdwn
@@ -14,7 +14,7 @@ This is one of those potentially hidden but time consuming problems.
   could use inotify. **done**
 * When easily available, remotes call the MeterUpdate callback as downloads
   progress. **done**
-* S3 TODO  
+* S3: TODO  
   While it has a download progress bar, `getObject` probably buffers the whole
   download in memory before returning. Leaving the progress bar to only
   display progress for writing the file out of memory. Fixing this would
@@ -32,7 +32,7 @@ the MeterUpdate callback as the upload progresses.
 * webdav: **done**
 * S3: **done**
 * glacier: **done**
-* bup: TODO
+* bup: **done**
 * hook: Would require the hook interface to somehow do this, which seems
   too complicated. So skipping.