Nob

A nob (short for network object) is a visual object belonging to the neural network, e.g. a neuron.
 * Nobs are the smallest parts of a network, which can be manipulated directly-
 * Compared to natural neural networks, biological neurons map directly to neurons (which is a nob) in NNetSimu. But dendrites in NNetSimu are normally composed of several nobs: Pipes (the straight lines) and knots (the link points of pipes).
 * Nobs fall into one of two categories: Natural nobs and artificial nobs.

Natural nobs have a counterpart in real biological neural networks. Natural nobs are:
 * Neurons
 * Pipes (dendrite sections)
 * Knots (dendrite link and branching points)

Artificial nobs are only tools for the construction of the network. Artificial nobs are:
 * Neurons for making connections
 * Input neurons
 * Output neurons
 * Connectors
 * Input connectors
 * Output connectors

The design philosophy for nobs is to give natural nobs a more organic, natural look, while artificial Nobs are deliberately angular. In the case of dendrites (pipes and knots) this concept is not yet implemented consistently. Maybe in a future version of NNetSimu, dendrites will look more natural.