be --dir DIR COMMAND now roots the bugdir in DIR without changing directories.

be --dir DIR COMMAND now roots the bugdir in DIR without changing directories.

Previously, for the directory structure
  A
  |-- X
  `-- Y
You could do something like
  A$ be --dir X diff --dir ../Y
Now it's
  A$ be --dir X diff --dir Y

The --root option to `be init` has been removed as redundant.  Replace
calls like
  be init --root DIR
with
  be --dir DIR init