str slice: Trim slice indexes to be in range.

Implemented list.copy. Fixes issue #54.

Use the storage cache not only for writing but also for reading. This
avoids reading stale data and thus data loss.

Implement basic slice object and string slicing

Added list.clear. Fixes issue #53.

Only step=1 and non-negative indexes are supported so far.

So far, only start and stop integer indexes are supported. Step is
not supported, as well as objects of arbitrary types.

Tweaks to list.pop.

Move INT_FMT, etc. declaration into global mpconfig.h .

This in particular makes it available for stm port.

* Fixes issue #51
* Adds a specific error message for when you try to pop an empty list.
* Releases some memory if the list has shurnk a lot.

Collect more memory statistics

Added SVG vector logo.

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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