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Looks like we can use the same Pin class for legacy pyb module and new
machine module.

Instead of return 0, which means EOF. There's no good way to detect EOF on
continuously active bus like UART, and treat timeout as just temporary
unvailability of data. .read() method of UART object will return None in
this case (instead of 0, which again measn EOF). This is fully compliant
with unix port.

pyb.repl_uart still exists but points to os.dupterm.

pyb module still has pyb.delay and pyb.udelay, but these now point to
time.sleep_ms and time.sleep_us respectively.

This requires makeinfo installed and wastes time (especially in CI).

The heartbeat is now controllable via a single function within the
wipy module.

Generally, ports should inherit INC from py.mk, append to it, not
overwrite it. TODO: Likely should do the same for other vars too.

All of these functions return positive small int, thus range is 2 bits less
than word size (30 bit on 32-bit systems, 62 bit on 64-bit systems).

E.g. Windows lacks this header.

Another function (like stat) which is problematic to deal with on ABI level
(FFI), as struct statvfs layout may differ unpredictably between OSes and
even different versions of a same OS. So, implement it in C, returning a
10-element tuple of f_bsize, f_frsize, f_blocks, f_bfree, f_bavail, f_files,
f_ffree, f_favail, f_flag, f_namemax. This is exactly the order described
in Python3 docs, https://docs.python.org/3/library/os.html#os.statvfs
(but note that os.statvfs() should make these values available as
attributes).

To avoid "-dirty" version previous and spurious "modified" output from
git status, etc.

As defined by the new API, since 'auth' is actually a  tuple
composed by the security type and the key.

MICROPYPATH environment variable is now honored, package are installed to
first path specified in it.

This allows to build libffi from source together with micropython, and is
useful for cross-compilation. Support for this was already merged
previously, to use:

make libffi
make MICROPY_STANDALONE=1

(To both commands appropriate cross-compilition flags can be added).

Only available when MICROPY_CAN_OVERRIDE_BUILTINS is enabled.

Cortex-M0, M0+ and M1 only have ARMv6-M Thumb/Thumb2 instructions.  M3,
M4 and M7 have a superset of these, named ARMv7-M.  This patch adds a
config option to enable support of the superset of instructions.

Addresses issue #1182.

See issue #1500.

Bionic libc in Android 1.5 missed log2() and nan() functions.