Fixes #160: CreateSymbolicLink creates shortcut with no target. Fixes #184: File.CreateSymbolicLink() should throw PlatformNotSupportedException() if OS < Vista. Fixes #185: Correct pinvoke signatures of CreateSymbolicLink and CreateSymbolicLinkTransacted functions.
Fixes #160: CreateSymbolicLink creates shortcut with no target.
Fixes #184: File.CreateSymbolicLink() should throw PlatformNotSupportedException() if OS < Vista.
Fixes #185: Correct pinvoke signatures of CreateSymbolicLink and CreateSymbolicLinkTransacted functions.

modulexcite/AlphaFS,thomaslevesque/AlphaFS,alphaleonis/AlphaFS