Cleanup

[bernhardmgruber]

This PR contains a few cleanup commits:

• rename tree mapping unit test file
• put binaries into root build dir
• use __NVCC_DIAG_PRAGMA_SUPPORT__ to detect how to suppress nvcc warnings
• supress a few nvcc warnings
• remove the simpletest example

[codecov]

Codecov Report

Merging #489 (2641ff8) into develop (687517f) will not change coverage.
The diff coverage is n/a.

❗ Current head 2641ff8 differs from pull request most recent head e703e70. Consider uploading reports for the commit e703e70 to get more accurate results

@@           Coverage Diff            @@
##           develop     #489   +/-   ##
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  Coverage    99.23%   99.23%           
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  Files           59       59           
  Lines         5392     5392           
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  Hits          5351     5351           
  Misses          41       41