HDF5/1.8.13 with intel/2014b and Szip dependency

this can be replaced by using `-DMPICH_IGNORE_CXX_SEEK` imho, so maybe do that instead?

probably via something like:

```python
makeopts = 'CXXFLAGS="$CXXFLAGS -DMPICH_IGNORE_CXX_SEEK"'
```

or, maybe we should enhance the existing HDF5 easyblock instead, and always use the `-DMPICH_IGNORE_CXX_SEEK` preprocessor flag (it doesn't hurt afaik)