Suppress creation of module symlinks for hierarchical MNS

[geimer]

In the context of a hierarchical module naming scheme, the default symlink farm prefixing the module path with the moduleclass easyconfig parameter is of very limited use. First, it creates "strange" modulefile layouts such as

numlib/
    Compiler/GCC/4.9.2/
        OpenBLAS
    MPI/GCC/4.9.2/OpenMPI/1.8.4/
        FFTW
        ScaLAPACK

which are hard to use in a sensible way. And second, the compiler and MPI modules only extend $MODULEPATH for the regular hierarchy, resulting in weird effects when loading these modules. Therefore, it's probably best to suppress the generation of these symlinks entirely.

[hpcugentbot]

Automatic reply from Jenkins: Can I test this?

[boegel]

@geimer: makes perfect sense, and if we merge this in before EB v2.0 we have a good excuse to break this ;)

[boegel]

Jenkins: ok to test

[hpcugentbot]

Refer to this link for build results (access rights to CI server needed):
https://jenkins1.ugent.be/job/easybuild-framework-pr-builder/1330/
Test PASSed.

[boegel]

Thanks @geimer, going in!