Binary output

[alecandido]

Since we're going to get huge output object (in particular considering huge Q2 grids, currently tested only with a single Q2) instead of dumping json/yaml file maybe it would be better to move towards a json/yaml header for a binary blob (with instructions to decode it, like "row-major, (10, 10, 100, 100), float64").

Even better: dump wiht numpy and the descriptions may simply tell the method to use... (check how to do it np.save)

[alecandido]

Current binary in yaml it's rather good, but we definitely need to apply some kind of compression to all the binary blobs.

[alecandido]

Compression done.

Do we want to reconsider the output format or binary-in-yaml design is fine as it is?

[felixhekhorn]

for the moment yes - maybe we can do more optimization in the future ...