- 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.

errormsg.h

@@ -24,9 +24,10 @@ typedef struct ErrMsg {
  * The newset message is always at the head of the list.
  *
  *  \param dump the error message list
+ *  \param current The currently active error message
  *  \param fmt the format for the message
  *  \return the new error message list head
  */
-ErrMsg *ErrPutMsg(ErrMsg *dump, char *fmt, ...);
+ErrMsg *ErrPutMsg(ErrMsg *dump, ErrMsg **current, char *fmt, ...);
 
 #endif