rename PoddSSHFileReferenceProcessorImpl to
SSHFileReferenceProcessorImpl for naming consistency
add a simple SSHFileReference implementation, abstract unit tests and
concrete test implementations.
add initial version of abstract test for PoddFileReferenceManager
- update test statement counts to work with 2 additional types in
poddBase schema
- modify test artifact fragment to use new file reference type
add a management-graph for file repositories to RepositoryManager