Initial OpenMP/GPU support #228
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It now behaves polymorphically and will create device fields when that is the `next` type and host fields otherwise
As libx3d2_backends links libx3d2 and xcompact/tests link both the linking order must be libx3d2_backends then libx3d2 to prevent duplicate symbols during linking.
This is to allow initialisation of the base class whether called by OMP/CPU or the OMP/TGT object
The code runs through the test successfully - need to confirm offload and check for data movement
This means data resides on the device only
Note this is only working on AMD GPUs (although it should be supported on NVIDIA GPUs w/Cray compiler)
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This branch implements the basic offloading of data using openMP with the ability to perform the
vecaddoperation.