exa2pro/starpu-max: porting work to Maxeler DFE @ fe5a8b7f1f7436031fc5f14b573ba98af550cfef

Samuel Thibault 8c681bf59e Disable disk_pack with o_direct for now		11 éve
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disk_compute.c	aba9b7562b Make disk test actually test all backends. Partly revert r13785 which was using a union as a structure.	11 éve
disk_copy.c	7b2bbc9659 Use powers of two so that o_direct can work	11 éve
disk_pack.c	8c681bf59e Disable disk_pack with o_direct for now	11 éve