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A few tests still fail on PYBLITE, and that's due to differences in the
available peripheral block numbers on the different MCUs (eg I2C(2)
exists on one, but it's I2C(3) on the other).

This new function controls what happens on a hard-fault:
- debugging disabled: board will do a reset
- debugging enabled: board will print registers and stack and flash LEDs

The default is disabled, ie to do a reset.  This is different to previous
behaviour which flashed the LEDs and waited indefinitely.

In tests/pyb is now a suite of tests that tests the pyb module on the
pyboard.  They include expected output files because we can't run
CPython on the pyboard to compare against.

run-tests script has now been updated to allow pyboard tests to be run.
Just pass the option --pyboard.  This runs all basic, float and pyb
tests.  Note that float/math-fun.py currently fails because not all math
functions are implemented in stmhal/.