[master] changelog for #1603

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+401.   [func]*         jinmei
+       libdns++: updated the internal implementation of the
+       MessageRenderer class.  This is mostly a transparent change, but
+       the new version now doesn't allow changing compression mode in the
+       middle of rendering (which shouldn't be an issue in practice).
+       On the other hand, name compression performance was significantly
+       improved: depending on the number of names, micro benchmark tests
+       showed the new version is several times faster than the previous
+       version .
+       (Trac #1603, git 9a2a86f3f47b60ff017ce1a040941d0c145cfe16)
+
 400.   [bug]           stephen
        Fix crash on Max OS X 10.7 by altering logging so as not to allocate
        heap storage in the static initialization of logging objects.