changes file for bug17852

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+  o Minor features (code hardening):
+    - Use tor_snprintf() and tor_vsnprintf() even in external and
+      low-level code, to harden against accidental failures to NUL-
+      terminate. Part of ticket 17852. Patch from 'jsturgix'. Found
+      with Flawfinder.
+
+  o Minor bugfixes (private directory):
+    - Prevent a race condition when creating private directories.
+      Fixes part of bug 17852; bugfix on 0.2pre13. Part of ticket
+      17852. Patch from 'jsturgix'. Found with Flawfinder.