repair external and internal links

...luster-documentation/software/numerical-libraries/fftw.md

...luster-documentation/software/numerical-libraries/hdf5.md

...software/numerical-libraries/intel-numerical-libraries.md

.../software/numerical-libraries/magma-for-intel-xeon-phi.md

...uster-documentation/software/numerical-libraries/petsc.md

...er-documentation/software/numerical-libraries/trilinos.md

...tation/software/omics-master/diagnostic-component-team.md

...m-cluster-documentation/software/omics-master/overview.md

...n/software/omics-master/priorization-component-bierapp.md

...anselm-cluster-documentation/software/operating-system.md

...4i/salomon/accessing-the-cluster/accessing-the-cluster.md

...t4i/salomon/accessing-the-cluster/outgoing-connections.md

docs.it4i/salomon/accessing-the-cluster/vpn-access.md

docs.it4i/salomon/environment-and-modules.md

docs.it4i/salomon/hardware-overview.md

docs.it4i/salomon/introduction.md

docs.it4i/salomon/network/7d-enhanced-hypercube.md

docs.it4i/salomon/network/ib-single-plane-topology.md

docs.it4i/salomon/network/network.md

docs.it4i/salomon/prace.md