function reconstructPacket(packet, buffers) {
    packet.data = _reconstructPacket(packet.data, buffers);
    packet.attachments = undefined; // no longer useful
    return packet;
}
Reconstructs a binary packet from its placeholder packet and buffers

@param {Object} packet - event packet with placeholders
@param {Array} buffers - binary buffers to put in placeholder positions
@return {Object} reconstructed packet
@public