(Fail to) Chase down old buggy renders

BUGS.rst

@@ -1,7 +1,8 @@
-- samples/python/python3.mgp: slide 44 is rendered wrong on Python 3,
-  compared to Python 2's rendering  UHH ACTUALLY it looks like rendering
-  changed in the last couple of days, current version is the same on Py2
-  vs Py3!  Except for minor differences in text positioning, probably resulting
-  from / returning floats now
-- samples/python/python3.mgp: slide 44 is rendered wrong on Python 2,
+- samples/python/python3.mgp: slide 44 is rendered wrong,
   compared to the original PDF from 2006
+- samples/python/python3.mgp: slide 44 was also rendered wrong a few days
+  ago, and is rendered slightly less wrong now -- but text/image relative
+  positioning was better a few days ago!  According to timestamps
+  my old test files were rendered on 2014-12-04 10:26 +0200, which is
+  after commit a480eb14e3cb8c1c560ca8039f591736b3f56f66, but I can't
+  reproduce those buggy render using that commit :/