Python long int implementation using C long long

Improve compatibility of examples with CPython (+ interp compatibility too)

Implicit "micropython" module contains (at least) codegeneration decorators.
Make it explicit, so an app could have "import micropython". On MicroPython,
that will be no-op. On CPython, that will give a chance to have a module
with placeholder decorators.

Delay between frames; run more generations.

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