Content consistency checks for new member nodes
Want to be able to detect systematic content errors for new Member nodes:
1) systemMetadata is parseable - existing getSystemMetadata() test should fail when it can't deserialize the systemMetadata, yes?
2) resourceMaps are parseable - pull a resourceMap listObjects(formatId=, use ResourceMapFactory to deserialize
3) checksum stability - content should have the same checksum every time it is pulled.