Modifications on notebooks and hands on in part 2

Closes #65 (closed)

This MR was first proposed as !77 (closed) but was closed as there were few improvements to perform in hands on and depending on a master without #114 (closed) was a pain.

Closes #90 (closed)

added 1 commit

• 3be5871a - Solution to exercises: fix weak vtable warnings (admittedly not prettily...)

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added 2 commits

• 16107ae8 - #90 (closed) Remove the term "slicing effect" which was improperly used.
• 0677a6fa - #90 (closed) Add paragraph about the slicing effect.

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changed the description

added 2 commits

• 463a4f9d - Missing dot added.
• a8e1885e - Missing brace.

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requested review from @jediaz

added 3 commits

• 18bb0c49 - Make a comment in solution clearer.
• d57d2cc0 - Object programming hands on: add back exercises in CMakeLists.txt.
• 9c740067 - Proposition to be more consistent about RoundToInteger argument, and to add...

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merged

mentioned in commit 49e1287c

mentioned in merge request !87 (merged)

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resolved all threads