Imports a Markov chain structure from a Tangram-II model. This method is further
described in section .
Usage: import_from_tangram(obj_name,
num_hidden_vars, system_variable_list)
where obj_name is the Tangram-II model's description file (the .obj file); num_hidden_vars is the number of system states which
represent the hidden states; and system_variable_list is a comma
separated list with the Tangram-II's model variable names, in the format
'Object.StateVariable'. This list must have num_hidden_vars
elements