exa2pro/starpu-max: porting work to Maxeler DFE @ eb0ae35785caa7e88609cd3922c2da545bf60f13

Samuel Thibault eb0ae35785 starpu_perfmodel_plot only works with FxT enabled		8 lat temu
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gpu_concurrency.c	2bcc6c9758 document what tests test	10 lat temu
long_kernel.cu	68658f16bf Add --enable-coverity flag to configure, to avoid building .cu files with nvcc which produces millions of lines of code we don't want to analyze	10 lat temu
overlap.c	ef395f6e4b when possible, use sizeof instead of a hard-coded value for a string length	8 lat temu
overlap.sh	eb0ae35785 starpu_perfmodel_plot only works with FxT enabled	8 lat temu