started fixing the generic loading process; renamed "Proprieties" into "Properties", "MoleculesSet" into "MoleculeSet", "ReactionsSet" into "ReactionSet", "specificLoader" into "loadFromXml", "Loadable" into "XMLLoadable"
#163 generic loader fixes
#163 generic loader fixes - WIP, does not compile - preparation of refactor of initFromLoad of XmlLoadable
#163 removed artefact file
#163 xml loader refactor: WIP, compiles but runtime error