fix

    layout fix

    added "(wiki)" after the new link titles.

    added links to module install relevant parts of the Modelio wiki,
    supplied by Etienne.

systemmodelling/connection-export.md
systemmodelling/en-installingmodules.png
systemmodelling/fmu-import-export.md
systemmodelling/generatefmi.png
systemmodelling/index.md
systemmodelling/maximize.png
systemmodelling/module_catalog.png
systemmodelling/modulecatalog.png
    added info from Etienne

    updated title

    markdown fix

simulators/20sim.md
simulators/openmodelica.md
systemmodelling/index.md
    Added information received from consortium partners regarding their
    tools and how to use them in relation to this project