[MERGE] make 'push' default to parent branch

[Scott Scriven]

* Aaron Bentley <aaron at aaronbentley.com> wrote:
> > at the expense of making things a bit harder for new users...
> 
> Quite the opposite.  An experienced developer will know *why* bzr is
> complaining that http doesn't support mkdir.  A new user will not.  A
> new user *ought* to understand "bzr: ERROR: No push location known or
> specified."

Comparing one error against the other misses an important point.  
The current behavior is guaranteed to fail, but the default URL 
approach will often just work.

If the "http doesn't support mkdir" error isn't clear enough, 
that's a different issue.  It's only one of several errors which 
could occur anyway, depending on the transport used.

It's also worth mentioning that new users may be experienced 
developers.  They just aren't familiar with bzr.


-- Scott