Bug Fix Numero Uno... Neeexxxxtttt

[Manor Askenazi]

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Following a quick phone-debug session with Steve Emsley (thanks Steve!) 
at the University of Warwick, the following patch has been generated, 
and should be used by those people who get a crash in heatbugs on line 
104 of MessageProbeWidget.m (i.e. a seg.fault occurs on the createEnd 
of a MessageProbeWidget).

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Please replace lines 99-101 of swarm/src/simtools/MessageProbeWidget:

  objWindows = (int *) malloc(sizeof(int)*argNum) ;
  argNum *= 2 ; 
  myWidgets = (Widget **) malloc(sizeof(Widget *)*argNum) ;

With:

  if(argNum)
    objWindows = (int *) malloc(sizeof(int)*argNum) ;

  argNum *= 2 ; 

  if(argNum)
    myWidgets = (Widget **) malloc(sizeof(Widget *)*argNum) ;
  else
    myWidgets = (Widget **) malloc(sizeof(Widget *)) ;

Then recompile the simtools library (type 'make' within swarm/src/simtools).
Then recompile heatbugs. It should now work.

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In addition to finding this bug, our discussion made me realise that the
probe system is not really apparent to the user-base on a first trial of
the system. Tomorrow I will post a little tutorial which shows some of the
cool stuff which can be done with probes, even with the simple heatbugs
example.

Regards,

Manor.