0.5.1

The new AdgMarker abstract class has been added to provide a common
ancestor to marker entities. AdgArrow (a filled arrow) is its first
renderable implementation.

The rendering customization is now provided by AdgDress, an index that
virtualizes the underlying AdgStyle and derived instances. This allows
some advanced operation, such as overriding a style in a specific branch
of the entity hierarchy. The deprecated AdgContext class has been removed.

The AdgPath class has been splitted in AdgTrail and AdgPath. The former
provides low level access to CpmlPath, allowing the implementation of
paths that do not fit in the global/local model. AdgLDim internally
uses a private AdgTrail to implement base and extension lines rendering.
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