HDF5/1.8.13 with intel/2014b and Szip dependency

this is the first HDF5 v1.8.13 easyconfig, so there's no need for the versionsuffix here

we only do that when we really need a build of this particular HDF5 version with a particular zlib version (to avoid conflicts with other packages that are used in the same dependency tree, for example), while a non-suffixed easyconfig already exists

in short: just drop the `versionsuffix` line, and adjust the file name accordingly