config_dirname

  CONFIG_DIRNAME - Return the path location of configuration files

   DIRNAME = CONFIG_DIRNAME

   Defines the default location for configuration files for vhlab-toolbox-matlab.
   By default, the location is in a directory called 'vhlab_configuration' that 
   is located in the same directory as vhlab-toolbox-matlab. 

   If the DIRNAME does not exist, it is created and added to the current Matlab path.