pin externals when creating a copy from specific revision
From: Stefan Kueng <tortoisesvn_at_gmail.com>
Date: Mon, 16 Feb 2015 20:01:19 +0100
I'm still doing some testing with the new --pin-externals feature, and I
then all externals get pinned at r100. But shouldn't in-repo externals
Also, the svn_client_copy6 API misses the SVN_DEPRECATED macro.
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