Enforce consistency among tutorials

[shkodm]

It would be nice to enforce particular structure of tutorials, so new system tests based on tutorials can be added easier and overall orientation around tutorials made simpler. For instance:

• Have different directories for input of different solvers with suitable names ( this is mostly done everywhere, apart from SU2-Calculix (see Bring consistency into SU2-CalculiX tutorial #36 ) )
• Have separate directories with the output of different solvers
• Have convention about the structure of the precice-config files. For instance consistent order of attributes in the m2n tag, so that it is easier to parse (for instance to change exchange directory when running with docker ).

[MakisH]

This is related to #28.

[MakisH]

I think that, apart from the parts represented in #28 (and maybe specific issues such as #86, #87, #88), we have done quite some progress here.

Since this is also currently a bit vague, I am closing it to favor breaking down the problem to individual, easily-evaluated issues.