Metacat

allow reading from xml_revision table when we are the doc owner

CNCoreImpl is replaced by CNodeService

implement CNAuthorization

Metacat does not implement CNIdentity - it is a stand-alone service

implement registerSystemMetadata

implement object format methods - using a separate class to do the actual metacat lookup/caching so that teh CN implementation looks cleaner

implement getLogRecords

include latest D1 common/lib changes

Initial check in of the MNodeService stub methods that implement the D1 MN* interfaces. CrudService methods will be transitioned into this class. The methods follow the D1 0.6.2 API thus far.

Also changed CNodeService to reflect minor changes to the D1NodeService class.

Add a static getInstance() method to CNodeService and make CNodeService a singleton.