Per Python3 io module semantics.

That at least makes stuff like "{:x}".format(1) to produce not completely
broken output.

Conflicts:
	py/objint.c
	unix-cpy/Makefile
	unix/Makefile

Conflicts:
	tests/basics/tests/exception1.py

Added some checks for number of arguments.

Conflicts:
	py/mpqstrraw.h

Parser no longer prints an error, but instead returns an exception ID
and message.

made DEBUG control CFLAGS in Makefiles other than stm as well.

Thanks to Dave Hylands for this.

Add combined image to GitHub front page README.md

Add missing ADC driver

Generic implementation if stream readall() method, immediately reused in unix io.FileIO implementation

Move towards Python-compliant interface of exceptions

Implemented support for `in` and `not in` operators.

added zip()

So far, don't work for strings as expected.

This implements internal args tuple of arguments, while still keeping
object useful for reporting C-side errors.

Further elaboration is needed.

This is useful because tuple is closest analog of C static array.

* Add ADC support for reading internal temperature sensor.
* Add ADC support for reading internal VREF/VBAT monitor.

* Add simple ADC driver, with support for ADC1 and all channels.
* Export MicroPython ADC object with read_channel function.
* Add stm32f4xx_adc.c and adc.c to Makefile.

* Add missing ADC driver from STM32F4xx_StdPeriph_Lib_V1.3.0