Grokcore.startup

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- Nothing changed yet.

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- Drop support for Python 2.7, 3.4, 3.5, 3.6.

- Add support for Python 3.7, 3.8, 3.9, 3.10, 3.11.

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- Rearrange tests such that Travis CI can pick up all functional tests too.

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- Python 3 compatibility.

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- Update tests.

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- Added new IPython-based interactive debugger which is used
automatically when IPython is available. Otherwise the gdb-style
debugger is provided.