Reorganized tutorial.  Added different level titles.  Added explanation and example for packages that support both list and array data.  Added explanation and example for utility files.  
Reorganized tutorial.  Added different level titles.  Added explanation and example for packages that support both list and array data.  Added explanation and example for utility files.  
aleaf/flopy,jentjr/flopy,aleaf/flopy,jentjr/flopy