GPU Communication Block Selectors

This MR introduces block selectors to the UniformGPUScheme, as until now it is only available for the CPU communication schemes, e.g., src/blockforest/communication/UniformBufferedScheme.h. A unit test to ensure proper behaviour is included.

added 9 commits

• 5f6a24cb...7fb0d512 - 2 commits from branch master
• f768e9c2 - Add optional block selectors to UniformGPUScheme
• 981e352a - Add first draft for testing block selectors in UniformGPUScheme
• eb816d3b - Add block selectors and write testing routine.
• a7fea7da - Fix assertion string.
• 5f71cb0d - Extend selectors to actual communication.
• 4b226407 - Fix test
• 003a65ea - Merge branch 'mr_gpu_comm_selectors' of i10git.cs.fau.de:walberla/walberla...

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added 1 commit

• a93bae75 - Fix unused variable error in release.

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approved this merge request

merged

mentioned in commit f5e8172f