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...
Change to:

"To get an overview of the software that EasyBuild is going to build and install we can use the `--dry-run`/`-D` command line option. This will show a list of easyconfig files that will be used, together with the module files that will be installed and their current availability (`[x]` marks available modules).

Note that EasyBuild will take care of all of the dependencies of WRF as well, and can even install the compiler toolchain as well if the corresponding modules are not available yet::
"