mpconfig.h will automatically pull mpconfigport.h.

This is just max value of current_bytes_allocated seen.

Unlike total_bytes_allocated, this tracks m_free()'s too.

Implement list addition.

Change dfu.py to be Python 2/3 compatible

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import works for simple cases.  Still work to do on finding the right
script, and setting globals/locals correctly when running an imported
function.

* Chane dfu.py to use Python 3 syntax to avoid dependency on Python 2.
* Update Makefile to call python instead of python2
* Fix #33

Generator objects now allocate the object and the state in one malloc.
This improvement fixes Issue #38.

Add quick impl for MP_BC_LOAD_CONST_BYTES which just creates qstr so far...

This is based on the fact that qstr so far behaves more like byte string
than like Unicode string (for example, "012"[0] returns 48 (int)).

This fixes Issue #29, and means the core is no longer dependent on
string functions, except strlen.

termcap is not needed on Linux.  Need to work out how to automatically
configure the Makefile...

Make micropython build on OpenBSD.

Does not build with BSD make.

E.g.:
/usr/lib/libreadline.so.4.0: undefined reference to `tgetnum'
/usr/lib/libreadline.so.4.0: undefined reference to `tgoto'
/usr/lib/libreadline.so.4.0: undefined reference to `tgetflag'
/usr/lib/libreadline.so.4.0: undefined reference to `tputs'
/usr/lib/libreadline.so.4.0: undefined reference to `tgetent'
/usr/lib/libreadline.so.4.0: undefined reference to `tgetstr'

Tested on linux too, works.