Otoole

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- Adds results processing and conversion of results
- CBC results are transformed into a folder of CSV files
- Missing intermediate results parameters are automatically generated
- Adds command ``otoole results cbc csv simplicity.sol ./results --input_datafile simplicity.txt``
- Removes dependency upon PuLP now that amply is available separately on PyPi
- Fixed bug with parameter names >31 characters in converting to Excel and fixed round trip
- Added conversions from Excel to datafile and datapackage to avoid intermediate commands so
``otoole convert excel datapackage <> <>`` and ``otoole convert excel datafile <> <>``
are both now legal

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- Fixes bug in writing to datafile where any values that matched the default were
ignored
- Adds CLI command to convert to Excel from datapackage e.g.
``otoole convert datapackage excel <datapackage.json> <to.xlsx>``
- Uses black code style and uses mypy and black for syntax checking and formatting

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- Add validation of names and fuels in datapackage
- Adds ``validate`` command to the command-line interface
- Define a validation config as a YAML file for names

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- Tidy up the command line interface
- Convert to/from SQLite database from/to datapackage
- Remove rotten pygraphviz dependency

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- Create a Tabular Data Package from an OSeMOSYS datafile

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- Visualise a reference energy system from a Tabular Data Package