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This follows up 0a7e01ae.

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/.

CPython compatibility: raise an error for operations on a closed file de...

A negative ms/us is now treated as a delay of 0 ms/us.  This patch also
improves the calibration of udelay.

More relaxed parsing of preprocessed qstr header

Make include dependencies neater, and adheres to the coding convention
that headers should not include headers.

Make pyboard.enter_raw_repl more robust

In CPython any operations on a file that has been closed already reaises
a ValueError with message "I/O operation on closed file"

py: Use <alloca.h> for alloca()

mingw: Add 'open' as extra builtin

Ignore .exe files

Well, it is bound to "detailed error reporting", but that's closest what we
have now without creating new entities.

This one was probable missed when creating mpconfigport.h, but the underlying
code (file.c) gets compiled and works perfectly so no reason to omit it.

The original parsing would error out on any C declarations that are not typedefs
or extern variables. This limits what can go in mpconfig.h and mpconfigport.h,
as they are included in qstr.h. For instance even a function declaration would be
rejected and including system headers is a complete no-go.
That seems too limiting for a global config header, so makeqstrdata now
ignores everything that does not match a qstr definition.

alloca() is declared in alloca.h which als happens to be included by stdlib.h.
On mingw however it resides in malloc.h only.
So if we include alloca.h directly, and add an alloca.h for mingw in it's port
directory we can get rid of the mingw-specific define to include malloc.h
and the other ports are happy as well.

Fix PB0 ADC typo.

Add device ID to autoflash script.

Fix pyboard.py tests.

This also adds a bunch of slashes separating pin that have multiple functions.

Specifically, nlr.h does.