Multiprocessing function `_apply_func_block` fails for padding larger than half-width of tile

[rhugonnet]

I noticed this while fixing tests in #738 for smaller files.

In this test function:

geoutils/tests/test_raster/test_distributing_computing/test_multiproc.py

Line 96 in dae10e4

def test_apply_func_block(self, example, padding):

If the padding is larger than the half-width of a tile (let's say a padding of 5, and tile size of 10), then the process fails (when it should work) without an error that makes it easy to understand that this is the cause.

[rhugonnet]

FYI @adebardo @belletva @adehecq