Added support for O_DIRECT #885
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MultiFile got support for file creation with the O_DIRECT option (provided the OS supports it) to bypass the kernel's file cache. It makes the I/O behaviour much more predictable which is useful for some real-time applications. It means that new tables using the MultiFile option can be written with O_DIRECT. It is not (yet) possible to use O_DIRECT on existing tables.
Close #882