Tr : System.arraycopy(...) equivalents for ByteBuffer/FileChannel

[Jeff Hain]

>For example, if wanting to copy bytes from a concurrently-read
>DirectByteBuffer (can't touch its position), to another ByteBuffer,
>one can only do a byte-loop (unless using disk as temp).
 
Just thought about using ByteBuffer.duplicate()
to avoid trouble with concurrent usage of position(),
but the general point still remains if FileChannel is involved,
and to avoid the boilerplate I'm doing.
 
-Jeff
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