[GocadSGridReader] Removed split information for nodes.
[GocadSGridReader] Removed unused functionality.
[GocadSGridReader] Added class GocadSplitNode.
[GocadSGridReader] Split readSplitNodesAndModifyElements() into readSplitInformation() and applySplitInformation().
[GocadSGridReader] Removed method removeNullVolumeElements().
[SGridGocadReader] Corrected cell index check in calculation.
[GocadSGridReader] Added getMesh(), removed getNodes() and getElements().

Completely reworked the internal mesh creation routines.
[GocadSGridReader] Delete read data.
[GocadSGridReader] Apply translation only to created data.
[GocadSGridReader] Handle nodes on externel border correct.
[GocadSGridReader] Rename to make lines shorter.
[GocadSGridReader] Overload to make life easier.
[GocadSGridReader] Save Nodes as GocadNodes.
[GocadSGridReader] Added addFaceSetQuad(), implemented getFaceSetMesh().