[MERGE] Set default push location to the parent branch

[Dmitry Vasiliev]

Very often for my projects I use the following command's sequence:

$ bzr pull URL
... some changes, commits
$ bzr push

At the 'bzr push' point I'm almost always forget specify the push URL 
which is the same as the parent URL, I guess mainly because there is 
some reflections with 'svn ci' for me. The attached patch uses the 
parent branch location if no explicit (or saved) location defined.

-- 
Dmitry Vasiliev (dima at hlabs.spb.ru)
   http://hlabs.spb.ru
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