- 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.

sicshdbadapter.h

@@ -19,5 +19,7 @@
 
 int SICSHdbAdapter(SConnection *pCon, SicsInterp *pSics, void *pData,
     int argc, char *argv[]);
+int HdbSubSample(SConnection *pCon, SicsInterp *pSics, void *pData,
+    int argc, char *argv[]);
 
 #endif /*SICSHDBADAPTER_H_*/