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travis-ci

New way to create repeated packed fields without using an iterator.

If we have the following:

    std::string data;
    protozero::pbf_writer pw(data);
    std::vector<int> v = { 1, 4, 9, 16, 25, 36 };

The "old" way using an iterator:

    pw.add_packed_int32(1, std::begin(v), std::end(v));

The "new" way without the iterator:

    {
        protozero::packed_field_int32 field{pw, 1};
        for (auto value : v) {
            field.add_element(value);
        }
    } // IMPORTANT! Destructor of packed_field_int32 is called
      // to finalize the repeated packed field.

Also adds pbf_writer::reserve() function.

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