Add lots more debug info. Still crashes.

Think we need to enable the exception handling.
Use -Os to save space - eventually revert to -O2 if it works
need exceptions for interrupts to work
Show status of buffers
Trailing whitespace
Move over BE fixes to FE
Track number of interrupts
Unix line endings
Follow spi_intr_example more closely
use correct(?) device ID
Bootstrap transfer - still not working!
Bootstrap after it has data to send