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A class for constructing and serializing a histpack file and index.

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    parent pointers and linknodes), not any revision content information.

    It consists of two files, with the following format:

    .histpack
        The pack itself is a series of file revisions with some basic header
        information on each.

        datapack = <version: 1 byte>
                   [<filesection>,...]
        filesection = <filename len: 2 byte unsigned int>
                      <filename>
                      <revision count: 4 byte unsigned int>
                      [<revision>,...]
        revision = <node: 20 byte>
                   <p1node: 20 byte>
                   <p2node: 20 byte>
                   <linknode: 20 byte>
                   <copyfromlen: 2 byte>
                   <copyfrom>

        The revisions within each filesection are stored in topological order
        (newest first). If a given entry has a parent from another file (a copy)
        then p1node is the node from the other file, and copyfrom is the
        filepath of the other file.

    .histidx
        The index file provides a mapping from filename to the file section in
        the histpack. In V1 it also contains sub-indexes for specific nodes
        within each file. It consists of three parts, the fanout, the file index
        and the node indexes.

        The file index is a list of index entries, sorted by filename hash (one
        per file section in the pack). Each entry has:

        - node (The 20 byte hash of the filename)
        - pack entry offset (The location of this file section in the histpack)
        - pack content size (The on-disk length of this file section's pack
                             data)
        - node index offset (The location of the file's node index in the index
                             file) [1]
        - node index size (the on-disk length of this file's node index) [1]

        The fanout is a quick lookup table to reduce the number of steps for
        bisecting the index. It is a series of 4 byte pointers to positions
        within the index. It has 2^16 entries, which corresponds to hash
        prefixes [00, 01, 02,..., FD, FE, FF]. Example: the pointer in slot 4F
        points to the index position of the first revision whose node starts
        with 4F. This saves log(2^16) bisect steps.

        dataidx = <fanouttable>
                  <file count: 8 byte unsigned> [1]
                  <fileindex>
                  <node count: 8 byte unsigned> [1]
                  [<nodeindex>,...] [1]
        fanouttable = [<index offset: 4 byte unsigned int>,...] (2^16 entries)

        fileindex = [<file index entry>,...]
        fileindexentry = <node: 20 byte>
                         <pack file section offset: 8 byte unsigned int>
                         <pack file section size: 8 byte unsigned int>
                         <node index offset: 4 byte unsigned int> [1]
                         <node index size: 4 byte unsigned int>   [1]
        nodeindex = <filename>[<node index entry>,...] [1]
        filename = <filename len : 2 byte unsigned int><filename value> [1]
        nodeindexentry = <node: 20 byte> [1]
                         <pack file node offset: 8 byte unsigned int> [1]

    [1]: new in version 1.
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