Fix symbolic link preview #156
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As mentioned in #155, this patch fixes the case when a symbolic link is listed.
It follows the link and calls

preview
recursively with the real path.The drawback is that the real file or directory name will be printed out instead of the symlink.
The other solution I could provide is to return the same array as the dir case but with another html value to distinguish link from a standard dir.
The only caution I see is an infiniteloop of link, but this would be due to user error on its link rather than the code itself.