```python
>>> a = DataBuffer('abcd')
>>> str(a)
'abcd'
```
This PR encodes a python3 str to bytes using `charmap`. It verifies that `bytes != str` to only encode a python3 str and not a python2 str.

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<tr class='logheader'><td><span title='2019-04-12 14:51:42 -0400'>2019-04-12</span></td><td class='logsubject'><a href='/public/binaryninja-api.git/commit/python?id=8f7901c4709826acc0e53aeea4442b1fb9a25876'>Add incoming edges for flow graph nodes</a></td><td>Rusty Wagner</td></tr>
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<tr class='logheader'><td><span title='2019-04-11 17:36:24 -0400'>2019-04-11</span></td><td class='logsubject'><a href='/public/binaryninja-api.git/commit/python?id=1eee7293d9a171ba6c2e1e3d33be6d693ac66aee'>Add partial support to get_string_at.</a></td><td>Brian Potchik</td></tr>
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