Method writeNode

Overflow node write structure is as follows: -- node type -- (2 bytes) -- next pointer -- (8 bytes) -- prev pointer -- (8 bytes) -- values -- (max size satellite size) @param r pointer to opened B+ tree file @throws IOException is thrown when an I/O operation fails

(RandomAccessFile r, BPlusConfiguration conf,
                          BPlusTreePerformanceCounter bPerf)