NSUser.m: NSTemporaryDirectory()

[Michael Scheibler]

GNUstep's NSTemporaryDirectory() returns the temporary directory plus
the user's name appended to it. In Apple's Foundation reference its
behaviour is defined as follows:

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NSTemporaryDirectory

This function returns the temporary directory on the user's system. 
NSString *NSTemporaryDirectory(void)

Returns a string containing the path of the current temporary directory.
If no such directory is currently available, this function returns nil.

See also NSStandardApplicationPaths, NSStandardLibraryPaths,
NSHomeDirectory

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GNUstep's NSTemporaryDirectory() never returns nil.

Are we trying to implement NeXT's behaviour or should we change
(improve?) these things?

Michael