Bug 6647: Add changes file

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+  o Minor bugfixes:
+     - Prevent rounding error in path bias counts when scaling
+       them down, and use the correct scale factor default.
+       Bugfix against 0.2.3.17-beta.
+     - Demote some path bias related log messages down a level
+       and make others less scary sounding.
+       Bugfix against 0.2.3.17-beta.