Improve opencl#161

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lungd wants to merge 8 commits intoopenworm:developmentfrom

lungd:improve_opencl

Commits on Jan 27, 2019

Add skip_display params
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Commits on Jan 28, 2019

Commits on Jan 29, 2019

Commits on Feb 8, 2019

Merge remote-tracking branch 'upstream/development' into development
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Commits on Feb 11, 2019

Set local_NDRange_size to 32 (MAX_NEIGHBOR_COUNT). Better performance with nvidia 940m. unchanged performance with intel cpu/gpu
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Test
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