Fix issue #1772: correct header in 'diff -r BASE:HEAD' or 'HEAD:BASE'.

[Alexey Dobriyan <ad...@mail.ru>]

Andy Whitcroft in issue #1772 wrote:

> 'svn diff' command can result in output in which the file headers within the
> diff are incorrect;

> under some circumstances a diff header will indicate one revision as the
> working copy when it is not.

There're problems with the second line of header of "diff -r BASE:HEAD" and
"diff -r HEAD:BASE" on specially crafted repository and working copies (test
script is at the webpage). It's "(working copy)" instead of (revision X).

It turned out to be these bugs are orthogonal to each other.

Please, review the patches and commit if they're ok.

	Alexey


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