Exceptions know source file, line and block name.

Also tidy up some debug printing functions and provide a global
flag to enable/disable them.

Add lean ("raw") socket module.

Add skeleton implementation of array.array and bytearray.

Byte code has a map from byte-code offset to source-code line number,
used to give better error messages.

Now searches both locals_dict and methods.  Partly addresses Issue #145.

So far, only storage, initialization, repr() and buffer protocol is
implemented - alredy suitable for passing binary data around.

Now working for class-defined methods: __getitem__, __setitem__,
__add__, __sub__.  Easy to add others.

Add store_item() virtual method to type to implement container[index] = val

mp_obj_int_get() can be used when just full resolution of C machine_int_t
is required (returns truncated value of long int). mp_obj_int_get_checked()
will throw exception if Python int value not representable in machine_int_t.

Change state layout in VM so the stack starts at state[0] and grows
upwards.  Locals are at the top end of the state and number downwards.
This cleans up a lot of the interface connecting the VM to C: now all
functions that take an array of Micro Python objects are in order (ie no
longer in reverse).

Also clean up C API with keyword arguments (call_n and call_n_kw
replaced with single call method that takes keyword arguments).  And now
make_new takes keyword arguments.

emitnative.c has not yet been changed to comply with the new order of
stack layout.

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