Fix inability to rename resulting tar on export if /tmp is on another filesystem (tmpfs) #166
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If the temporary directory is on a different filesystem than the one korb is called from, go's
os.Renamefunction is unable to rename the file, because it would need to be moved (copy actual bytes) between filesystems:The above error was suppressed by not handling it.
This PR avoids using a potential tmpfs, because of it's possible size restrictions and the requirement to move the resulting file, replaces the deprecated
ioutil.TempFilefunction and enabled error handling on renaming.