[MOD] Storage: refactored random disk access to allow different implementations of file access and buffer operations; moved read and write operations from TableDiskAccess to the Buffer class to allow usage of native methods by other implementations; added BufferTests
[MOD] Storage: implementation of BlockFileAccess and Buffer using FileChannel and direct ByteBuffer
[MOD] Core, NIO: Java 6 compliance
Dutch language updated for 7.8.

Dutch language file updated for release 7.8.
Meervoud

Meervoud: bestanden
letters->tekens & z -> s

Kleine typos verbeterd.