LinTrain Code

Support for smart throttle on status bus
Some type safety improvements
Allow DCC stimulus generation for GPSim at CPU frequencies other than 4MHz

Adjusted for newer gputils and my updated build environment

Python3 compatibility and provide accessors to match pure Python version

Further Python3 fixes
Handling of "hidden" track sections (e..g in tunnel)
Improved turnout motor control

Notes on the "LT-Ring" comms used by the booster / block detector

Made the context header variant-specific so that feature tests work
Shuffled memory allocations - there's not really any "non volatile", it's
system config
Added a command to set the mapping of optical detectors to track polarity
Configuration of detector types and mappings in boot block of ARB

Placeholder for new design command station

First pass at code for the PIC on the booster boards. There are some issues
with the build system at the moment.

Two versions of a DCC power booster design:
- a block detector version with four blocks
- an auto-reverser with four opto detectors to trigger polarity change

Added a Python module to communicate with the new command station and present
the same interface as the kernel driver parallel port version