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This commit adds a virtual method to QgsMapLayer to enable the creation of custom elevation profiles for any type of layer. The methods returns a pointer to a helper class of type QgsAbstractProfileSource which is a factory for profile generators (cf. documentation for QgsAbstractProfileSource). Existing layers that derive from QgsAbstractProfileSource just override this method returning a *this* pointer. As the method is *sipified* it can be used in python to declare custom profile source for classes derived from PluginLayer (ownership of the QgsAbstractProfileSource must then be managed on the python side).