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Signed-off-by: Jean-Yves TINEVEZ <jean-yves.tinevez@pasteur.fr>

LocalZProjector for large images opened as virtual stacks in Fiji.

See merge request !1

This reverts commit d2da3bd9.

Because it's cool.

Not super fast.

This makes it possible to remove dependency on commons-math.

Probably faster, but I don't find the restriction on
features and the code elegance satisfactory.

This one makes processing of images larger than RAM possible,
simply using the Fiji virtual stack thingie. It is long, but possible.

On 'normal' images, it is about 15% slower: For a
1148 x 1148 x 26 x 2 images, it takes about 6.30s for the whole process,
against 5.67s before. But this is worth it.

Also, we cannot do median projection any more, but again, this is
worth it.

This reverts commit bb3bb176.
Did not have a positive impact.

Does not have a positive impact.

This is enough to fix an important bug with virtual stacks memory leak.

This is enough to fix an important bug with virtual stacks memory leak.

So that we can deal with images that are opened as virtual stack in
ImageJ.
It works but we needed to make sacrifices:
- we do not handle mlutiple channels.
- you can only project 1 slice, no more
- you cannot regularize the height-map with median filter at the end.