unixfs: improve robustness

[Michael Jung]

Unfortunately, the file dialog still crashes now and then.

Changelog:
	Pass correct pointer to SHFree in case of failure in UNIXFS_path_to_pidl
	Return E_FAIL if we can't get the unix path in IPersistFolder3::InitializeEx
	Return E_NOAGGREGATION if non-NULL pUnkOuter is given to the constructor
-- 
Michael Jung
mjung at iss.tu-darmstadt.de
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