readme for scale ipelet

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+This ipelet provides an easy way to scale everything that is not
+scaled by the normal scaling operation, i.e., the size of symbols, the
+pen thickness, and the size of arrowheads.  To install the ipelet,
+download [scale.lua](scale.lua) and copy it to `~/.ipe/ipelets/` (or
+to some other directory for ipelets).
+
+# Changes #
+
+**27 August 2015**
+first version of the scale ipelet online