0.6.3

The text manipulation logic has been moved inside the AdgTextual
interface and a new entity based on pango (AdgText) has been added.
Also AdgToyText implements AdgTextual so all the text entities are
now interchangeable.

The demo program has a new dialog page that allows to customize
the title block of the drawing. The zoom hints have been moved
outside the paper so the drawing can be considered finalized.

The CPML library has its own test framework. Anyway tests have
been improved generally so it is now possible to generate a
report by using "make test-report".

The missing extents computation on AdgRDim, AdgADim and AdgArrow
are now in place. By calling adg-demo with the -E option it
is possible to visually verify the extents status.

A bunch of bugs, most notably the wrong glade catalogdir detection
and some extents computation, have been resolved.
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