Pushing down store-specific code to ModificationCommandBatch.
Batch_separator_not_appended_if_batch_header_empty test fix
Less navigation; same destination... (Remove NavigationAccessor and its cache)

We were previously looking at the CLR type of the navigation to determine whether it was a collection or not. Now we're using the IsUnique metadata from the foreign key. This means that the CLR type info caching for navigations is not required anymore.
Add model to params for DataStoreCreator deletion