Changed ControlNetVersioner to avoid protobuf errors with large networks.

      }

      headerCodedInStream.PopLimit(oldLimit);

      // Without closing and re-opening the protocol buffers break... no clue

      //   why other than it's got some static data around keeping track

      //   maybe. We need to do this for it to reset it's idea of the total

      //   bytes though. Doing it every time is too expensive - so we're going

      //   to just do it periodically.

      IstreamInputStream *pointInStream = NULL;

      CodedInputStream *pointCodedInStream = NULL;

      for (int cp = 0; cp < p_networkHeader->pointmessagesizes_size(); cp ++) {

        if (cp % 50000 == 0 && pointCodedInStream && pointInStream) {

          delete pointCodedInStream;

          pointCodedInStream = NULL;

      // We need to regenerate the coded input stream every so many bytes

      // choose 64 MB as a safe amount

      int streamThreshold = 1024 * 1024 * 64;

      int currentStreamSize = 0;

      input.seekg(filePos, ios::beg);

      IstreamInputStream *pointInStream = new IstreamInputStream(&input);

      CodedInputStream *pointCodedInStream = new CodedInputStream(pointInStream);

      pointCodedInStream->SetTotalBytesLimit(1024 * 1024 * 512,

                                             1024 * 1024 * 400);

          delete pointInStream;

          pointInStream = NULL;

        }

      for (int cp = 0; cp < p_networkHeader->pointmessagesizes_size(); cp ++) {

        if (pointInStream == NULL) {

          input.close();

          input.open(file.expanded().toLatin1().data(), ios::in | ios::binary);

          input.seekg(filePos, ios::beg);

        int size = p_networkHeader->pointmessagesizes(cp);

        currentStreamSize += size;

          pointInStream = new IstreamInputStream(&input);

        if (currentStreamSize > streamThreshold) {

          currentStreamSize = size;

          delete pointCodedInStream;

          pointCodedInStream = NULL;

          pointCodedInStream = new CodedInputStream(pointInStream);

          // max 512MB, warn at 400MB

          pointCodedInStream->SetTotalBytesLimit(1024 * 1024 * 512,

                                                 1024 * 1024 * 400);

        }

        int size = p_networkHeader->pointmessagesizes(cp);

        oldLimit = pointCodedInStream->PushLimit(size);

        filePos += size;

   *   @history 2016-04-22 Jeannie Backer - Removed thrown exception in

   *                           toPvl() when unable to find TargetRadii values. Instead, we

   *                           will just leave these values blank. References #3892

   *   @history 2017-12-07 Jesse Mapel - Changed how often read streams are recreated to avoid

   *                           protobuf errors.

   */

  class ControlNetFileV0002 : public ControlNetFile {

    public: