Cuda rebase#6

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eddy16112 wants to merge 68 commits intoICLDisco:mainfrom

eddy16112:cuda-rebase

Commits on Oct 18, 2016

Commits on Oct 19, 2016

Commits on Oct 20, 2016

Commits on Oct 24, 2016

Commits on Oct 25, 2016

clean up comments and remove unused define
eddy16112
committed

Commits on Oct 26, 2016

remove NB_GPUS; use mca to set cuda buffer size; use mca to set cuda datatype support enabled or not; check cuda calls.
eddy16112
committed

Commits on Oct 28, 2016

add some protection for the case there is no mem for pack/unpack
eddy16112
committed

Commits on Oct 31, 2016

clean up testing
eddy16112
committed

Commits on Nov 1, 2016

Commits on Nov 15, 2016

mca_cuda_convertor_init is called in MPI_Init if using pre-connect, so do not init kernel support until confirming buffer is gpu buffer.
eddy16112
committed