First implementation of a jupyter nb based tutorial

[LukasGold]

Includes many changes to

• osw.express, as those have been rigorously tested during the writing of the tutorial
• osw.data.import_utility as the design had some flaws and was not as easy to use as it could have been
• Documentation and doc strings

[coveralls]

Pull Request Test Coverage Report for Build 11709304733

Details

• 25 of 68 (36.76%) changed or added relevant lines in 5 files are covered.
• 8 unchanged lines in 4 files lost coverage.
• Overall coverage decreased (-0.5%) to 52.369%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
src/osw/core.py	2	3	66.67%
src/osw/model/static.py	0	2	0.0%
src/osw/data/import_utility.py	9	23	39.13%
src/osw/express.py	10	36	27.78%

Files with Coverage Reduction	New Missed Lines	%
src/osw/controller/file/wiki.py	1	76.74%
src/osw/model/static.py	1	42.55%
src/osw/data/import_utility.py	2	13.48%
src/osw/express.py	4	69.23%

Totals
Change from base Build 11699189617:	-0.5%
Covered Lines:	2596
Relevant Lines:	4646

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💛 - Coveralls