[MERGE] Remove supports_single_merge_revision cruft from log

[John Arbash Meinel]

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Ian Clatworthy wrote:
> This was discussed on the list 2 months back and it was agreed
> by all concerned (Kent Gibson, Martin Pool, Vincent Ladeuil) that
> it was only used inside bzrlib and no longer had any relevance.
> 
> The most important bit here is the removal of a XFAIL test
> that I see every time I run "bzr selftest log", many times
> every week. It also simplifies the log code. As a side effect
> of this change, another test also needed to be removed. It
> was testing an assertion that isn't true and just happened to
> "pass" because the obsolete code being removed was triggering
> a BzrCommandError. Sigh.
> 
> In the reviewer has any concerns, I can dig up the email
> discussion (but I can't be bothered right now).
> 
> Ian C.
> 

BB:approve

John
=:->

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