how to create a BzrDir of specified format

[Martin Pool]

I'm just trying to work out how to make a BzrDir, Branch, etc, of a  
specified format for the purposes of testing.  The current api seems  
a bit odd - strongly inclined to create the default format.  As a  
result many of the existing tests need to set the default format  
before they do anything.

One perverse effect is that

   BzrDirMetaFormat1.create('.')

creates an instance of a different format!

It seems to me that by static methods on e.g. a BzrDirFormat we ought  
to be able to create an instance and the relevant internal components.


-- 
Martin Pool