Blanket wide to all .c and .h files.  Some files originating from ST are
difficult to deal with (license wise) so it was left out of those.

Also merged modpyb.h, modos.h, modstm.h and modtime.h in stmhal/.

Proposed license/copyright file header.

Add device ID to deploy make target for stmhal.

By default mingw outputs 3 digits instead of the standard 2 so all float
tests using printf fail. Using setenv at the start of the program fixes this.
To accomodate calling platform specific initialization a
MICROPY_MAIN_INIT_FUNC macro is used which is called in mp_init()

mingw: Add implementation of realpath()

RTC doc fix

You can run a local script on the pyboard using:

    python pyboard.py test.py

where test.py is the local script you want to run.

Since firmware lives in a build directory which already specifies the
board name, no real reason to also have the firmware have the board
name.

BUILD is build-$(BOARD) by default.

This renames MICROPY_HW_HAS_WLAN to MICROPY_HW_ENABLE_CC3K (since it's a
driver, not a board feature) and wraps all CC3000 code in this #if.
It's disabled for all boards.

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/.

The mingw port used _fullpath() until now, but the behaviour is not exactly
the same as realpath()'s on unix; major difference being that it doesn't
return an error for non-existing files, which would bypass main's error
checking and bail out without any error message.

Also realpath() will return forward slashes only since main() relies on that.

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()