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Feature: Add NVTX markers to OpenACC implementation. #29

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This is not polished enough to include generically (i've not bothered to find the nvtx include path / lib directory in a generic fashion).

It indicates that the initial wait time is for the first call to OUTPUT, so not within the scope of the GPU hackathon to improve.

This is for reference really, rather than to actually be merged.

Still very hardcoded and not ideal. Could do with polish before merging (if at all, not required for other than profiling use

Typically in C you only build this in for profiling runs, and use Macros to include the appropriate calls so they can be ommitted from full runs as noops
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