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Less copies and more efficient stream implementations in ReaderprotobufIO

Luke Pickering requested to merge lpickeri/HepMC3:feature/protobufIO_lesscopies into master

Changes the protobuf reader to use stream and file reader types packaged with protobuf that minimize IO copies

Offers a decent speed up of about 15%, counteracting the slowdowns added during 'modularisation MR'(!310 (merged)). This MR is called 'ZeroCopyStreams' on the below figure.

  • CENTOS7 test failing because no std::make_unique in gcc 4.8. I can fix this, but tomorrow.
Edited by Luke Pickering

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