New EasyConfigs for HDF5-serial, ie HDF5 without MPI support.

They are based on the HDF5-serial EasyBlock which allows to compile HDF5 without MPI support.
Merge branch 'develop' of github.com:hpcugent/easybuild-easyconfigs into hdf5-serial
Remove HDF5-serial easyconfigs based on the HDF5-serial easyblock and add new HDF5 easyconfigs without MPI-support
Merge branch 'develop' into hdf5-serial
add missing easyconfigs for zlib/Szip deps
Merge pull request #513 from boegel/hdf5-serial

add serial easyconfigs for HDF5 + deps