Removing unused parboil datasets.

hpvm/test/parboil/datasets/histo/default/input/DESCRIPTION

hpvm/test/parboil/datasets/histo/default/input/img.bin

hpvm/test/parboil/datasets/histo/default/output/ref.bmp

hpvm/test/parboil/datasets/histo/large/input/DESCRIPTION

hpvm/test/parboil/datasets/histo/large/input/img.bin

hpvm/test/parboil/datasets/histo/large/output/ref.bmp

hpvm/test/parboil/datasets/mri-gridding/mrig_small.tgz

...est/parboil/datasets/mri-gridding/small/input/DESCRIPTION

.../test/parboil/datasets/mri-gridding/small/input/small.uks

.../parboil/datasets/mri-gridding/small/input/small.uks.data

...est/parboil/datasets/mri-gridding/small/output/output.txt

hpvm/test/parboil/datasets/mri-gridding/small/output_md5.txt

...t/parboil/datasets/mri-q/large/input/64_64_64_dataset.bin

.../parboil/datasets/mri-q/large/output/64_64_64_dataset.out

...t/parboil/datasets/mri-q/small/input/32_32_32_dataset.bin

.../parboil/datasets/mri-q/small/output/32_32_32_dataset.out

.../test/parboil/datasets/nodeSwap/1K/input/.matrix1.txt.swp

.../test/parboil/datasets/nodeSwap/1K/input/.matrix2.txt.swp

hpvm/test/parboil/datasets/nodeSwap/1K/input/DESCRIPTION

hpvm/test/parboil/datasets/nodeSwap/1K/input/matrix1.txt