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On x64, native emitter now passes 70 of the tests.

Also add command line option to unix port to select emitter.

Based on the discussion in #433. mp_load_attr() is critical-path function,
so any extra check will slowdown any script. As supporting default val
required only for getattr() builtin, move correspending implementation
there (still as a separate function due to concerns of maintainability
of such almost-duplicated code instances).

This is to reduce ROM usage.  stream_p is used in file and socket types
only (at the moment), so seems a good idea to make the protocol
functions a pointer instead of the actual structure.

It saves 308 bytes of ROM in the stmhal/ port, 928 in unix/.

This makes isinstance(X, object) and issubclass(X, object) true for all
X.

Finishes addressing issue #424.

In the end this was a very neat refactor that now makes things a lot
more consistent across the py code base.  It allowed some
simplifications in certain places, now that everything is a dict object.

Also converted builtins tables to dictionaries.  This will be useful
when we need to turn builtins into a proper module.

Towards addressing issue #424.

Had a small increase to ROM usage (order 60 bytes).

Implement del

This does not affect code size or performance when debugging turned off.

To address issue #420.

Change pfenv_print_int to take machine_uint_t rather than unsinged in

Allow floating point arguments with %d,i,u,o,x,X formats

py: Support 3-arg getattr() builtin (with default value).

With this change, the following works:

>>> print('%#x' % 0x1234567890abcdef)
0x1234567890abcdef

Hash table can now be completely full (ie now NULL entry) before a
resize is triggered.  Use sentinel value to indicate delete entry in the
table.

map: When removing a key, don't NULL the entry, but mark as deleted.

Quite natural to have d[int] = handle_int .

That's how CPython has it, in particular, "import __main__" should work.