export-pathways-v2

ExportPathways.py that uses refactored backend (ElsevierAPI.ResnetAPI.FolderContent.FolderContent class). Code of ExportPathways.py is only altered to utilize new backend.

• Unlike export-pathways-v1, references are not duplicated
• Some attributes of relations are missing ("Authors" missing in some tests)
• And yet the resulting RNEF is bigger

export-pathways-v1

Using old ZeepToNetworks.get_pathways().
Known issues:

• outputs duplicated references;
• resulting file is smaller but contains more attr types, compared to what gets there after refactoring (which one is less corrupted is subject to investigation).