Changed the diffusion tensor MC sim objects from lists to the ListType 'DiffTensorSimList'.
These changes are part of the solution for bug #7979 (https://gna.org/bugs/?7979).
The 'append()' and '__setattr__()' methods of 'DiffTensorSimList' have been set to dummy functions.
Authored by: bugman 2007-01-13
Parent: [r2994]
Child: [r2996]
