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- Add some useful functions, such as ``trace_count()``, ``get_traceInfo()``
- ``fromfile``, ``tofile``, ``create_by_sharing_header`` functions support ``istep`` and ``xstep`` parameters to deal with the segy whose steps of inline/crossline is not 1
- Add ``tools.guess`` function to guess the locations and steps of inline/crossline
- Add ``tools.fromfile_by_guess``, ``tools.tofile_by_guess``, ``create_by_sharing_header_guess`` to support unknown segy files
- Support windows/MSVC