common_ApplicationFolder icon

[Bertrand Dekoninck]

Hi everyone, and also Ivan because it's about gui.

Here is my first patch to gui to bring it an Applicationfolder icon. 
NSApplicationFolder already exists in base so I didn't need to add it.

I've added few lines to NSWorkspace.m to display an icon on all 
Application folder. And made an icon from the defaultFolder icon and and 
the default unknownApplication icon.

See the two files attached.

Can you please review them ? And see if is possible to get rid of the 
sysAppDir variable ?

Cheers,
Bertrand Dekoninck

PS :
Who will I have to ask for a copyright assignment in the future ? Greg ?

common_ApplicationFolder.patch
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common_ApplicationFolder.tiff
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