simtb

   simtb()  - Initializes the simtb GUI

   Usage:
    >> simtb
    >> simtb('param_filename');
    >> simtb(sP);

   INPUTS: (OPTIONAL)
   If no input:        Opens GUI for interactive use of the simulation toolbox.
   If string input:    Builds paramter structure based on  definitions in 'param_filename'
                       opens the GUI to edit/run the simulation.
                       Note that 'param_filename' must be on the user's path.
   If structure input: Opens the GUI with the given parameter structure.

   OUTPUTS:
   (none)

   see also: simtb_create_sP(), simtb_main()