ENH: make streams name() methods virtual throughout (issue #479)

src/OpenFOAM/db/IOstreams/Fstreams/IFstream.C

src/OpenFOAM/db/IOstreams/Fstreams/IFstream.H

src/OpenFOAM/db/IOstreams/Fstreams/OFstream.C

src/OpenFOAM/db/IOstreams/Fstreams/OFstream.H

src/OpenFOAM/db/IOstreams/IOstreams/IOstream.C

src/OpenFOAM/db/IOstreams/IOstreams/IOstream.H

src/OpenFOAM/db/IOstreams/IOstreams/Istream.H

src/OpenFOAM/db/IOstreams/IOstreams/Ostream.H

src/OpenFOAM/db/IOstreams/Sstreams/ISstream.H

src/OpenFOAM/db/IOstreams/Sstreams/OSstream.H

src/OpenFOAM/db/IOstreams/Sstreams/ReadHex.H

src/OpenFOAM/db/IOstreams/Sstreams/prefixOSstream.H

src/OpenFOAM/db/IOstreams/StringStreams/IStringStream.H

src/OpenFOAM/db/IOstreams/StringStreams/OStringStream.H

src/OpenFOAM/db/IOstreams/StringStreams/StringStreamsPrint.C

src/OpenFOAM/db/IOstreams/Tstreams/ITstream.H

src/OpenFOAM/db/IOstreams/hashes/OSHA1stream.H

src/OpenFOAM/db/IOstreams/token/token.H