Adding a new serie of tutorials

[florentLutz]

In this pull request a new serie of tutorials has been added to help the user get familiar with the coding in the FAST-OAD framework. It consists in taking a simple problem and coding it with various tools ranging from a pure Python implementation to coding and using FAST-OAD. It is separated in 5 notebooks.

A couple of issue to discuss :

• What number do we use for the name of the folder ? I've put 02 for now.
• Inside the tutorial there are groups registered as FAST-OAD modules with an id starting with tutorial. Is there a risk that they appear when listing modules at project level ?
• There are links to folders inside the Notebooks which works fine when opening Jupyter Notebook but not Lab, is there a way to make those links work in Lab ?
• There seems to be an issue with the VariableViewer both in the 02_explanation folder and the 01_custom_modules folder. Is there a need to open a GitHub issue ?

[christophe-david]

Just writing down an idea about the problem we should define: why not a payload/range computation ?

• the performance model should just output the consumed fuel
• a TOW model would simply compute the MTOW

I guess the optimization of fuel consumption could still take place, but with less convolution. And we could also consider a different payload (max payload), constraint the MTOW, and find the maximum achievable range.

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[florentLutz]

Round 2: I responded to all the comments that were made and closed everyone that I agreed with. Those that are left open mght need further discussing. For the separation between the two sets of notebooks: I made it so the notebook 5 explains the same thing as the custom module notebook, Consequently all references to the custom module notebook were deleted and a README was added at the root of the notebook folders to explains the differences between the two. Paragraphs were added to prepare some future works, manely on how hard it would be to add a new model in pure_python and partials derivatives. Added two proper paragraphs on the N2 diagram, the use of the set_val function and a widget for component selection. I also tried to improve readability by removing some parts of phrases and, adding, commas, as, much, as, possible :stuck_out_tongue_winking_eye:

[florentLutz]

Made the requested changes on grammar, typos and phrasing Tweaked the accuracy and number of significant digits so that MDA results work Changed the number of significant digits so that we can see that Scipy and OpenMDAO gives better results Still an issued with the wing mass formula (to discuss)