set_train_data only accepting 2 args (as opposed to 5 args documented in the C++ bindings)

[bakoontz]

Attempting to call set_train_data() per the published C++ API results in the following:

File "/usr/local/lib/python2.7/dist-packages/fann2/libfann.py", line 314, in set_train_data
def set_train_data(self, *args): return _libfann.training_data_set_train_data(self, *args)
TypeError: training_data_set_train_data() takes exactly 3 arguments (6 given)

[FutureLinkOpenSource]

When we started maintaining this package, the code was made to work with current python versions and other fixes. We don't use fann2 any more, but if you want to provide a patch for any missing functionality, we'll integrate it.