Instructions that refer to the cavity case need to be updated

I haven't checked them all, but at least the following two pages need updating:

• http://www.openfoam.com/download/install-windows.php
• http://www.openfoam.com/download/install-binary.php

The reason is that the tutorial incompressible/icoFoam/cavity is now a group of cases and not a single case. You have at least two possibilities:

• Use the path incompressible/icoFoam/cavity/cavity
• Use the Allrun script, instead of blockMesh+icoFoam

For more details: http://bugs.openfoam.org/view.php?id=2149#c6527

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Side note: I only spotted this while trying to answer a question on the forum: http://www.cfd-online.com/Forums/openfoam-installation/176161-openfoam-plus-v1606-compiling-installing-problems-2.html#post618348