Yes, I know, a good compiler will optimise this away, but I feel this is
neater.

These are default arguments after a bare *.

Adding this bytecode allows to remove 4 others related to
function/method calls with * and ** support.  Will also help with
bytecodes that make functions/closures with default positional and
keyword args.

In preparation for implementing default keyword arguments.

"1/0" is sacred idiom, the shortest way to break program execution
(sys.exit() is too long).

TODO: Likely doesn't match Python semantics for negative numbers.

The way it is, just crashes app. And optimizing to
"raise ZeroDivisionError" is probably too much.

This matches CPython behavior and hopefully can be treated as general
Python semantics.

One of the reason for separate "message" (besides still unfulfilled desire to
optimize memory usage) was apparent special handling of exception with
messages by CPython. Well, the message is still just an exception argument,
it just printed specially. Implement that with PRINT_EXC printing format.

Eg class A(): pass would fail an assertion.

objgenerator: Handle default args to generator functions.

Iterators and ducktype objects can now be arguments of yield from.

Extends previous implementation with * for function calls to * and **
for both function and method calls.

vm: Implement CALL_FUNCTION_VAR opcode (foo(*(1, 2, 3))).

Addresses #397.

Pretty much everyone needs to include map.h, since it's such an integral
part of the Micro Python object implementation.  Thus, the definitions
are now in obj.h instead.  map.h is removed.

Mostly just a global search and replace.  Except rt_is_true which
becomes mp_obj_is_true.

Still would like to tidy up some of the names, but this will do for now.

All board config macros now begin with MICROPY_HW_.

Renamed PYBv10 to PYBV10, since macros should be all uppercase.

Made SDCARD_DETECT configurable in mpconfigport.h, so that the SD
detect pin can be easily configured.

Caught by CPython test_pep380.py.

According to PEP380 and caught by CPython test_pep380.py .

vm: Save current active exception on opening new try block.