Merge RDFWriterMgr in RDFDataMgr.
Merge setup into RIOT.init.
Deprecate package "out" NT, NQ, RDFJSON writers - use RDFDataMgr.
Leave IO_Jena in public API for compatibility but 
  put the private contents into system.IO_JenaReader/Writer
  just because its quite long.


git-svn-id: https://svn.apache.org/repos/asf/jena/branches/arq-riot-output@1453415 13f79535-47bb-0310-9956-ffa450edef68