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Some ports may want to compile with generic MICROPY_VFS support but without
the VfsFat class.  This patch allows such a thing.

Minimal config can be now build with:

./make-minimal BOARD=...

This is required because of Makefile.exports magic, which in its turn depends
on PROJ_CONF to be set correctly at the beginning of Makefile parsing at all
times. Instead of adding more and more workarounds for that, it's better to
just move minimal support to a separate wrapper.

Also, remove Zephyr 1.5 era cruft from Makefile, and add support for Zephyr's
"run" target which supercedes older "qemu" target in upstream.

This is a typical problem with make: we want to trigger rebuilds only
if file actually changed, not if its timestamp changed. In this case,
it's aggravated by the fact that prj.conf depends on the value of
BOARD variable, so we need to do some tricks anyway. We still don't
try to detect if just BOARD changed, just try to generate new
prj.conf.tmp every time (quick), but do actual replacement of prj.conf
only if its content changed.

This is so that the filename of the test doesn't clash with the module name
itself (being "websocket"), and lead to potential problems executing the
test.

MICROPY_LONGINT_IMPL_LONGLONG doesn't have overflow detection, so just
parsing a large number won't give an error, we need to print it out
to check that the whole number was parsed.

This makes int.from_bytes() work for MICROPY_LONGINT_IMPL_LONGLONG.

These short unit tests test the base uPy methods as well as parts of the
websocket protocol, as implemented by uPy.

@dpgeorge converted the original socket based tests by @hosaka to ones
that only require io.BytesIO.

This test just tests that the basic functions/methods can be called with
the appropriate arguments.  There is no real test of underlying
functionality.

Thanks to @hosaka for the initial implementation of this test.

Two independent fixes:
- need to prefix symbols referenced from asm with underscore;
- need to undo the C-function prelude.

Mostly intended to ease experimentation, no particular plans for APIs
so far (far less their stability), is_preempt_thread() provided is
mostly an example.

Actually, this removes -fno-omit-frame-pointer workaround for Zephyr.

By adding back monotonically increasing field in addition to time field.
As heapsort is not stable, without this, among entried added and readded
at the same time instant, some might be always selected, and some might
never be selected, leading to scheduling starvation.

esptool 1.3 now supports both Python 2.7 and 3.4+.
Updated github link to now-official espressif repo.

*a, = b should always make a copy of b, instead, before this patch
if b was a list it would copy only a reference to it.

I.e. they don't run successfully with MICROPY_LONGINT_IMPL_NONE
and MICROPY_LONGINT_IMPL_LONGLONG (the problem is that they generate
different output than CPython, TODO to fix that).

The use of large literal numbers is a big no-no when it comes to writing
programs which work with different int representations. Also, some checks
are pretty adhoc (e.g using struct module to check for 64-bitness). This
change bases entire detection on sys.maxsize and integer operarions, and
thus more correct, even if longer.

Note that this change doesn't mean that any of these tests can pass with
anything but MPZ - even despite checking for various int representations,
the tests aren't written to be portable among them.