LinTrain Code

Converted /proc/dccstat to use seq_file method
Device names adjusted to cope with UDEV no longer being able to set them
Attempts at some error handling
- don't lock up the kernel if the command station doesn't ACK
- Report this as an error, pass to Python code as an exception
Better diagnostics on XTC file read failure (exceptions!)
Crude handling of crossings (declared as "turnout" in XTC)