Add is_hxl to HAPI resource metadata
Use resource name and format where available rather than generating filename from URL (breaks names of files used for tests)
Remove use of Reader member variable prefix and explicitly pass file_prefix in kwargs instead
Remove "identifier" and rely on file_prefix in kwargs to be consistent
Set filename once available (so same filename is used in different functions even when resource is not available)
Move fixtures to fixtures/input
Fix and test for: when use_hxl is True, filename is created in the constructor of ConfigurableScraper, but then when data is read later, that filename is not used