exa2pro/starpu-max: porting work to Maxeler DFE @ bc49f72836553972f92b026b71c08532af7380b6

Cédric Augonnet bc49f72836 Do not spawn too many threads if the tasks are too big. While we now have a		16 lat temu
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pi.c	8fd98c847d provide a performance model name for the pi example	16 lat temu
pi.h	bc49f72836 Do not spawn too many threads if the tasks are too big. While we now have a	16 lat temu
pi_kernel.cu	bc49f72836 Do not spawn too many threads if the tasks are too big. While we now have a	16 lat temu