"bzr send" does not work with revision ranges

[Ansgar Burchardt]

Summary:
It is currently not possible to specify revision ranges via "bzr send -r A..B" to forward only specific changes upstream.
I encountered this problem when commiting several (unrelated) changes locally that I wanted to forward to different bug reports.

How to reproduce:
1. Clone a repository.
2. Change and commit two files.
3. Execute "svn send -r last:2..last:1 -o test".
Note that test includes the changes from both commits.

Expected result:
The bundle should only contain the changes introduced in the last commit (cf. "bzr diff -r last:2..last:1"). Compare also with "git format-patch -1 <rev>".
At least "bzr send" should abort with an error instead of including more commits in the bundle.

Workaround:
Use branches (takes more of my time though) or use "bzr diff" and send only the patch upstream (and add commit message by hand).