write the documentation for this module.

just like reload(sys).  Test that this is so.  Closes SF bug #422004.

    _PyImport_FixupExtension() on the exceptions module.  Now
    reload(exceptions) acts just like reload(sys) instead of raising
    an ImportError.

    This closes SF bug #422004.

This is part of SF patch #440292.

Documentation for difflib/ndiff refactoring: more of the ndiff functionality
has been moved to the underlying library (difflib).

This closes SF patch #445413.

Update greeting message to avoid the long copyright notice.

error.

remembers what it is supposed to do. :-(

Remove unused variable and import

confident that the old code was utterly broken -- the worse that can
happen is that the new code is still broken.)

(This command seems to be essentially untested; should fix that...)

Edit comment

  Cater to that.
+ Major speed boost via not reading more of files than necessary.  This
  was no slouch before; now it screams.
+ Improve msg when giving up on a goofy future statement.