Gaia 2.4.6

• Update to Eigen 3.4.4. It is now a new external dependency.
• Force compilation with C++11

Gaia 2.4.5

• Improved and new Python scripts for model training

  • Generate classification project files and train models given groundtruth and filelist
  • Balancing classification datasets
  • Training models given a directory
  • Log parameters and PID for each classification task when training

• Code cleanup and build fixes