0.6.1

The canvas now has printing support when compiled with GTK+ enabled.
The media setup can be associated to the canvas so this data can be
accessed to provide a consistent behavior between different backends.

The demo program can now render the drawing to an SVG file.
Generated files are stored in the user document directory.

Uncomplete entities now fail gracefully instead of complaining for
insufficient data. This provides an easy way to implement optional
machinings: the optional groove in the adg-demo program is working
by leveraging this feature.
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