Fix width-one iteration slices on GPU

When iteration_slice was specified, the GPU code generator used to handle integer slice components wrongly, setting start == stop instead of stop == start + 1. This MR fixes that and provides tests.

Also, this reveals a more fundamental problem with iteration slices on GPU; see #103

added Bug label

requested review from @holzer

assigned to @da15siwa

mentioned in merge request lbmpy!182 (merged)

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• 6f69c7b3 - fix new tests in absence of cupy

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mentioned in commit ada89c01