Fix bug in imports if several scripts are defined in a single HTML page
Add "None" after setting __file__, to avoid unwanted results in the console
Fix #29 : docstring "leak" when defining function: unexpected behaviour of console
Fix #30 : Slice Class takes no arguments, takes comma, takes anything
Fix #12 :  Error in *dir()* operation: resulting list items are not "proper" strings
Fix #40 : print with name error
In editor, run test suite in __main__ but other tests in specific namespace
In editor, run test suite in __main__ but other tests in specific namespace
Fix #39 : built-in function after range statement