idea for reusing forwards/backwards code in Network
bidirectional generalized neurons
small changes to network
still need to create output sequence (use reference?)
added comments for set-like API
drafted Network
added relational operators, need to document Neuron and Network
miscellaneous tweaks to code, no docs yet
Added Neuron overview comments
added Neuron docs
started Network docs
still need to write Network::clone
still need clone
draft done, docs done
tweaks and refactoring of Network
discovered an output ordering issue going backwards
need decide how to mark neurons as output (order may be important)
finished draft and docs
XOR test updated, debugging compile
removed obsolete XOR files