exa2pro/starpu-max: porting work to Maxeler DFE @ f08dbb39237ff18c07ad5109eee086fa792dd8dd

Samuel Thibault 8c681bf59e Disable disk_pack with o_direct for now		%!s(int64=11) %!d(string=hai) anos
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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.	%!s(int64=11) %!d(string=hai) anos
disk_copy.c	7b2bbc9659 Use powers of two so that o_direct can work	%!s(int64=11) %!d(string=hai) anos
disk_pack.c	8c681bf59e Disable disk_pack with o_direct for now	%!s(int64=11) %!d(string=hai) anos