Building from source/Dependencies: Hint that binary packages are usually available #178
Description
In our Building from source : Dependencies page, users sometimes follow a path that leads them directly to each dependency, overlooking the hint that binary packages are usually enough. A use case for that is people building a specific version of preCICE (or with specific dependencies/compiler options).
Let's put some alert boxes in the beginning of every dependency, pointing further down to the System guides.