Ecnet

- Removed extraneous lines in error_utils.py
- Added exceptions for empty sets in model.py

- Update to server.py syntax (some method names have been changed, compare your scripts to the new examples!)
- Overhauled data_utils.py
- Reformatted model.py
- Inclusion of genetic algorithm for input feature dimensionality reduction
- Artificial bee colony functionality for hyperparameter tuning now relies on ECabc Python package, it is no longer integrated into ECNet
- Update to database format (your old databases will need to be edited to remain compatible!)

Neural network training hyperparameters can now be tuned using an artificial bee colony optimization algorithm. For more on artificial bee colonies: https://en.wikipedia.org/wiki/Artificial_bee_colony_algorithm

Fixed issues related to limiting the input parameter dimensionality.
Files edited:
- ecnet/limit_parameters.py
- ecnet/server.py
- setup.py