Fix revlog-ng interaction with old-http. revlog.py wasn't trying to detect the version of a revlog file that doesn't exist on the filesystem (as is the case with old-http). Additionally, there was an off-by-one error in httprangereader.read (ranges in HTTP Range headers are inclusive), making it get more data than what was asked for. This made a struct.unpack complain that "unpack str size does not match format". Finally, with the two fixes above, test-static-http fails, since BaseHTTPServer doesn't understand ranges and returns too much data. Work around that by reading only the specified amount.

abort: impossible time zone offset: 4444444
transaction abort!
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abort: invalid date: '1\t15.1'
transaction abort!
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abort: invalid date: 'foo bar'
transaction abort!
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abort: invalid date: ' 1 4444'
transaction abort!
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abort: date exceeds 32 bits: 111111111111
transaction abort!
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abort: No such file or directory: .../test/bar