PropositionUnitizer is an AMF component that performs preprocessing steps on propositions. 
		These steps include converting reported speeches and questions, resolving co-references, and creating 'I' nodes for every 'L' node. 
		This implementation serves as the default PropositionUnitizer, which injects 'I' nodes for every 'L' node. It accepts input and returns xIAF format. 
		The component can be connected to Turninator to inject 'I' nodes into the output of Turninator, as most AMF components process the 'I' nodes.