move paraview_hello_world notebook from examples to HOWTOs; add cell triggering paraview installation on Colab

[AgnieszkaZaba]

Addresses #1467

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 85.22%. Comparing base (5a49cb0) to head (9b49e79).
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  Coverage   85.22%   85.22%           
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  Files         376      376           
  Lines        9266     9266           
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  Hits         7897     7897           
  Misses       1369     1369           

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[slayoo]

Thank you @AgnieszkaZaba!

Let me suggest to:

• move this .ipynb file to the _HOWTOS folder (it does not reproduce results from the paper, Paraview was not used in the paper, while it does serve the purpose of explaining how to use Paraview to visualise results from 2D prescribed-flow simulations)
• annotate the ln -s ... workaround explaining that it aims to solve a problem with the Ubuntu package (especially that after Ubuntu upgrades on Colab, the problem will likely cease to exist, and the ln -s ... line will trigger an error, while the Paraview installation ill be fine)

[AgnieszkaZaba]

Thanks @slayoo!
Definitely it belongs to howtos. I will move it.
Don't know yet what to do with the second point.

And I'll will look up ipyparaview

[slayoo]

Don't know yet what to do with the second point.

We could:

• add a comment with links to https://discourse.paraview.org/t/paraview-error-while-loading-shared-libraries-libpdal-base-so-13-cannot-open-shared-object-file/14000 and https://discourse.paraview.org/t/paraview-error-while-loading-shared-libraries-libpdal-base-so-13-cannot-open-shared-object-file/14000
• do linking only in case the target path does not exist (this will also make this cell re-runnable on Colab):
• remove sudo - it shouldn't be needed on Colab (?)

! if [ ! -f /usr/lib/libpdal_base.so.13 ]; then ln -s /usr/lib/libpdal_base.so.15 /usr/lib/libpdal_base.so.13; fi

And I'll will look up ipyparaview

Thanks! (but let's do it independently of this PR)

[AgnieszkaZaba]

* [ ]  add a comment with links to https://discourse.paraview.org/t/paraview-error-while-loading-shared-libraries-libpdal-base-so-13-cannot-open-shared-object-file/14000 and https://discourse.paraview.org/t/paraview-error-while-loading-shared-libraries-libpdal-base-so-13-cannot-open-shared-object-file/14000

I will add this link as a second one.

[slayoo]

there is a typo, here's the url: qgis/QGIS#52433 (comment)

[AgnieszkaZaba]

Thanks for noticing!
Do you know why the second line with ldconfig getting me warnings? And it looks like it is not needed.

[slayoo]

Thank you!