D-Net

specific iterator for country propagation

Added generic Iterator over the list of information gathered from the reducer

fix error on parsing abstract

updated to consider the new class Utils and the new values in Propagation Constants classes

updated to store properties of the value

class to contain the methods common to the propagation classes among the propagation types

update of the constants for the propagation

map-reduce to implement the propagation of the association between project and result through the existence of semantic relations

map to count the number of results having a semantic relation of type isSupplementedBy that also have a relation isProducedBy with at least one project

added test to verify the parsing of EPMC record