This avoids a bug when saving which sets the file name for the wrong tab, and makes it clearer what you are being asked to save.

Avoids progress reporting arrow overlapping the line numbers.

Python reports line numbers based on the code context it has. These
can be wrong if the selection is part of a larger file. Padding the code
then allows the raw numbers being reported to be used.

._update_indent() was changed not to take arguments and IPython.core.usage.quick_guide was removed.

In test_execute_async_returns_failure_on_runtime_error_and_captures_expected_stack the comment was causing an IndentationError, changing it to a docstring fixes the problem. I don't think this is related to IPython but probably a python 3.6 problem.

traceback.format_exception is supposed to ignore the tb argument if it is None but
in 3.4 the current traceback is always printed
https://github.com/python/cpython/commit/c3f417dc47b3a9564608c98cd176c530d9ebdf09#diff-e57ff53a569d0ebbe201ad0c102ee27e

Adds numpy and matplotlib to startup code.
Also silently executes a new interpreter as it starts so that the
completion api is populated.

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The IPython InputSplitter is assuming an interactive front end whereas
we have the whole code at once and do not have to anticipate users
possibly entering more. The new InputSplitter overrides
behaviour of IPython InputSplitter for these cases.
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The marker should be placed at the end of the block not the start.
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Avoids issues with mocking signals etc.
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It makes it easier to integrate with other code. This uncovered an
error in the code execution that has been fixed here. Previous changes
were not always executing the code as blocks and this caused
some tests to pass when they would fail in the block-based scenario.
We now only execute as blocks so the test now covers this.
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This effectively becomes the model for code execution within
a code editor.
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