Converted the preiously-ifdefed code for fast brake and fixed nu into FNN options.
Use exception references in XS code.
Docs for the Matlab build.
Added the Matlab-specific build
Fixed the build for GCC 11.3.
Added the FloatNeuralNet experiments in slow start and arrested bouncing.
More MNIST & FloatNeuralNet experiments:
For MNIST demo, added a trapeze mode with absolute X coordinates instead of relative widths (and it works even worse).