simtb_create_sP

   simtb_create_sP()  - Initializes parameter structure

   Usage:
    >> sP = simtb_create_sP;  
    >> sP = simtb_create_sP(param_filename);
    >> sP = simtb_create_sP(param_filename, M, nC);
    >> sP = simtb_create_sP([], M, nC);

   INPUT: 
   If no input       Builds parameter structure based on default values
   param_filename  = parameter filname [OPTIONAL]. If provided, parameter values 
                     will be revised by definitions in param_filename. 
   M               = number of subjects [OPTIONAL, default is 10].
   nC              = number of components [OPTIONAL, default is all sources]

   OUTPUT:
   sP              = parameter structure

   see also: simtb_params(), simtb_checkparams()