Compressed i/o

Merged Matthieu Schaller requested to merge updated_io into master

This adds gzip compression to the datasets within the HDF5 outputs. That can save a lot of storage space for arrays that are constant (mass,...) or similar/regular (IDs, h, ...).

We can play with the chunk sizes and compression levels later on, when we have "real" runs and a parameter file.

It "solves" issue #106 (closed).

Feel free to remove the source branch.

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