Fix occasional error in LocalFileGzip read #484
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I'm not sure what triggered this bug that is different from before, but when I cleared out my local DB I couldn't load features any more. The error was cryptic, saying something like "length should be >=0, got <some negative number>". I finally tracked it down to
readinLocalFileGzipwhere the "position" and "offset" were swapped. I'm guessing they were both usually 0, which is why it usually worked, but occasionally they were not 0 and it failed.