[MERGE] fix bzr log --short and add a test

[Ian Clatworthy]

Ian Clatworthy has voted tweak.
Status is now: Conditionally approved
Comment:
The core fix has been applied to bzr.dev. linear_view_revisions() needs 
to stay. The test is good (and needs merging into bzr.dev).

For details, see: 
http://bundlebuggy.aaronbentley.com/project/bzr/request/%3C49710CB8.4010904%40arbash-meinel.com%3E
Project: Bazaar