The attached patch fixes some L&F issues on MacOSX:

- IDLE now reacts to file-open AppleEvents, which means that if a user 
associates IDLE.app with .py files IDLE will open .py files when the user 
double-clicks on them

- Hide the tcl/tk console window that gets opened by default when IDLE is 
in an application bundle (that's a misfeature of aquatk)

- Patch the menu's to make sure they better conform to the HIG.

- PyShell/EditorWindow  status_bar no longer overlaps with the resize 
widget in the lower-left corner of the window

Open issues:

- When you double-click on a file and IDLE is not yet open the file will be 
opened, but IDLE will open the default shell window just above it :-(

- I'm not terribly happy with the code changes that implement the 
updated menu structure.

- The default keybindings on OSX are the windows keybindings. I haven't 
checked yet if that can be fixed programmaticly, I also haven't verified if 
the macos keybindings are fully correct for OSX.

- The general L&F is still wrong, but that isn't really IDLE's fault: tcl/tk 
doesn't fully conform to the HIG yet (dialogs without title bars, wrong 
default dinwos background, wrong widget for tabbed windows, ...).