[PATCH] Rough cut at update-move support for properties

I've just been getting my teeth into this update-move code and this is a rough patch (based on code duplication rather than proper factoring) that is where I've got to.  It supposedly adds support for pushing the incoming properties-change across to the moved location, where currently we just push the text-change.

It seems to still pass the op-deth-test 39 and update_tests.py 61-69 to the same degree (many XFAILs).

I'm just posting this so you (Philip et el.) can take a look if you want to.  I might proceed by extending the tests to check props and then committing it if it works, but really I want to factor it better -- maybe by reusing svn_wc_merge5() or the guts thereof, sooner or later.

- Julian

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