- Scriptcontext debugged to be working

- Added a drivable adapter to scriptcontext nodes
- Added subsampling to simulated histograms (and as a general option) in
  order to support Gumtree testing.

nxdataset.h

@@ -71,4 +71,7 @@ char  *getNXDatasetText(pNXDS dataset);
 int   putNXDatasetValue(pNXDS dataset, int pos[], double value);
 int   putNXDatasetValueAt(pNXDS dataset, int address, double value);
 
+pNXDS cutNXDataset(pNXDS source, int start[], int end[]);
+pNXDS sumNXDataset(pNXDS source, int dimNo, int start, int end);
+
 #endif