Nth PR on develop branch for easybuild-docs, for N=6


Hi @boegel, @stdweird,

I think the new structure is better visible at this point; can you validate?
Best way to visualise it is this one: http://easybuild-docs.readthedocs.org/en/develop/
However, giving the feedback in github style over here would help it advance faster, I guess...
trim all of the above:

```
$ eb --software-name=HPCG --toolchain=goolf,1.4.10
[...]
== building and installing HPCG/2.1-goolf-1.4.10...
[...]
== COMPLETED: Installation ended successfully
[...]
```