Update docs.it4i/software/numerical-languages/octave.md,...

Update docs.it4i/software/numerical-languages/octave.md, docs.it4i/software/numerical-languages/opencoarrays.md, docs.it4i/software/numerical-languages/r.md, docs.it4i/software/numerical-libraries/fftw.md, docs.it4i/software/numerical-libraries/gsl.md, docs.it4i/software/numerical-libraries/hdf5.md, docs.it4i/software/numerical-libraries/intel-numerical-libraries.md, docs.it4i/software/numerical-libraries/petsc.md, docs.it4i/software/numerical-languages/matlab.md files
Deleted docs.it4i/software/numerical-languages/matlab_1314.md, docs.it4i/software/numerical-libraries/magma-for-intel-xeon-phi.md files