[MERGE] [0.19] preserve old `bundle` UI, add format selection

[Ian Clatworthy]

Aaron Bentley wrote:
> Martin Pool wrote:
>> I don't care much about the old implementation; if it was ugly then
>> I'm happy to get rid of it too.  However, I don't think we should just
>> suddenly change the meaning of the command.  People are accustomed to
>> writing 'bzr bundle ../OTHER > FILE" and that should still work.
>> Ideally that can be just syntactic gloss on the current
>> implementation.
> 
> Here is a patch that allows "bundle" to emit the merge directive to
> stdout.
> 

On behalf of many of us addicted to 'bzr bundle > xx.patch', thanks. I'm
trying to kick the habit and use send instead of bundle but I appreciate
 stdout being the default destination again.

Ian C.