TEST: Move tests into fsl package

...test_transform/testdata/nonlinear/coefficientfield.nii.gz

...est_transform/testdata/nonlinear/displacementfield.nii.gz

...orm/testdata/nonlinear/displacementfield_no_premat.nii.gz

fsl/tests/test_transform/testdata/nonlinear/ref.nii.gz

fsl/tests/test_transform/testdata/nonlinear/src.nii.gz

fsl/tests/test_transform/testdata/nonlinear/src2ref.mat

...est_transform/testdata/test_transform_test_axisBounds.txt

...s/test_transform/testdata/test_transform_test_compose.txt

...ts/test_transform/testdata/test_transform_test_concat.txt

...sform/testdata/test_transform_test_flirtMatrixToSform.txt

...ts/test_transform/testdata/test_transform_test_invert.txt

...ansform/testdata/test_transform_test_scaleoffsetxform.txt

...t_transform/testdata/test_transform_test_transform_00.txt

...t_transform/testdata/test_transform_test_transform_01.txt

...t_transform/testdata/test_transform_test_transform_02.txt

...t_transform/testdata/test_transform_test_transform_03.txt

...t_transform/testdata/test_transform_test_transform_04.txt

...t_transform/testdata/test_transform_test_transform_05.txt

...t_transform/testdata/test_transform_test_transform_06.txt

...t_transform/testdata/test_transform_test_transform_07.txt