Script me more !

Improvement:

• more scripting functions of Sqlite.exe:
  • '.output', '.print' (output next sql orders or print to a file)
  • '.dump', '.read' (database exported or imported as SQL orders)
  • '.open' (database)
  • '.backup , '.restore' (database exported or imported as database)
• infrastructure:
  • reformat with 'black -py33' the code
  • switch to github actions and pytest