Support other filter format

[savmickael]

Currently we support tiff file through gdal.
We support other formats thanks to gdal : hdf5
Check that we support hdf5, raw and csv and add examples

[dumasl]

I believe what we really need is support for xml filters.

We should allow someone to give us a xml filter with tags defining :

• where the hot point is located,
• whether or not the filter is oversampled,
• and its size

Or, at least we should be able to translate those files into filters Sirius handles.
All scenarios are really covered by a gdal supported format and two additional arguments to set the hot point coordinates (which we do have since #18). The Sirius doc actually explains how Sirius comprehend the oversampling factor.