[Svnmerge] Ignore initialized revisions (was Re: Reflected blocks)

[Michael Willmott]

> In this case, I think that a single patch would still fit this
> definition.

Ok, Issue #2851 addresses this patch, which can be found here:
http://subversion.tigris.org/nonav/issues/showattachment.cgi/681/svnmerge_ignoreInitializedRevisions-2.patch

I've written the test into the existing test that exposed the changed
behaviour since all the setup is already in place.

The only area of concern I have with this patch at the moment is having 
to force property checking for all revisions being considered, which was 
previously only done when --bidirectional was specified.  This means 
that svnmerge is making a lot more calls to svn and with Raman's recent 
patch to resolve transitive merge property conflicts the extra work 
seems a little pointless.

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Michael Willmott
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