[Users] Cactus Tutorial

[Roland Haas]

Hello Steve,

thank you very much for providing this. This is great!

> Please send comments, flames, etc. Thanks.
Comments:
* in the list of stuff to install, it should also cover OSX (homebrew
  and macports). Win10 would be nice but is maybe tricky.
* how would plotting work inside of the container?
* those install commands are not needed in the container or in the nds
  machine are they? This should likely be stated.
* how to install "which" is only described after the user is asked to
  run "which mpirun". This should be changed.
* do you sometimes need to explicitly ask for perl?
* it may be good to sort the list of packages alphabetically to make it
  easier (for us) to add / remove packages from the list
* I think GetComponents --parallell has a bug right now:
https://trac.einsteintoolkit.org/ticket/2060 which did not (yet) make it into the release branch
* it maybe good to explain what "%" and "!" do in a jupyter script. How
  would these commands look like if someone chose to take us up on the
  offer to get a shell?
* the build command used "make -j5" but the text above claims it uses
  "-j2"
Flames:
* none
Thanks:
* many

Yours,
Roland

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