With unicode enabled, this patch allows reading a fixed number of
characters from text-mode streams; eg file.read(5) will read 5 unicode
chars, which can made of more than 5 bytes.

For an ASCII stream (ie no chars > 127) it only needs to do 1 read.  If
there are lots of non-ASCII chars in a stream, then it needs multiple
reads of the underlying object.

Adds a new test for this case.  Enables unicode support by default on
unix and stmhal ports.

Addresses issue #753.

Add teensy core files and use same toolchain as stmhal

Fix teensy to build on latest tree.

Put #include of mpconfig.h before misc.h
Replace uses of ARRAY_SIZE with MP_ARRAY_SIZE

This method apparently should be part of stream interface.

This script uses expected test results as generated by run-tests --write-exp,
and requires only standard unix shell funtionality (no bash). It is useful
to run testsuite on embedded systems, where there's no CPython and Bash.

emitnative in particular requires nlr_* to be real functions, so doesn't
compile with MICROPY_NLR_SETJMP=1.

Mostly to run testsuite on targets which doesn't have CPython.

dummy_data field is accessed as uint value (e.g.
in emit_write_bytecode_byte_ptr), but is not aligned as such, which causes
bus errors or incorrect behavior on any arch requiring strictly aligned
data (ARM pre-v7, MIPS, etc, etc).

But much smaller and memory-efficient. Uses Python builtin data structures
(dict, tuple, int) to describe structure layout.

Once the code switches to using DMA, this can be removed.

From now on, all new tests must use underscore.

Addresses issue #727.

Addresses issue #622.

Implementing it as a static constant is a bit peculiar and require cooperation
from long int implementation.

See discussion in issue #50.

qemu: fix typo in readme

Added hexfile target

Conflicts:
	stmhal/pin_named_pins.c
	stmhal/readline.c

Renamed HAL_H to MICROPY_HAL_H.  Made stmhal/mphal.h which intends to
define the generic Micro Python HAL, which in stmhal sits above the ST
HAL.