bundlerepo: remove unused 'repo' parameter
Revision
7c231754a621 (filelog: add file function to open other
filelogs, 2011-05-10) added a _file() method to revlog, which also
required a 'repo' parameter to be added to bundlefilelog's
constructor. The _file() method was then removed in
b95a5bb58653
(filelog: remove unused _file method, 2015-01-22), which made the
constructor parameter unused, so let's remove that too.
histedit: fix --edit-plan
--edit-plan was completely broken from the command line because it used an old
api that was not updated (it would crash with a stack trace). Let's update it
and add tests to catch this.