Release 0.3.1
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  * gv_interface: fix device discovery by using 255.255.255.255 as broadcast address.
  * gv_interface: don't crash if there is no INET interface.
  * camera: make ArvCamera introspection friendly (John).
  * evaluator: fix comparison when one of the operand is a double.
  * python: don't crash on access to buffer data.
  * build: zlib check.
  * build: make configure pass even if gobject introspection is not available.