RF: re-work applyxfm tests - no longer rely on external data. Use benchmark

unit_tests/applyxfm4D/applyxfm4D_fail/feedsInputs

unit_tests/applyxfm4D/applyxfm4D_fail/feedsRun

unit_tests/applyxfm4D/applyxfm4D_fourdigit/feedsInputs

unit_tests/applyxfm4D/applyxfm4D_fourdigit/feedsRun

unit_tests/applyxfm4D/applyxfm4D_in.nii.gz

unit_tests/applyxfm4D/applyxfm4D_mat.mat

unit_tests/applyxfm4D/applyxfm4D_nn/feedsInputs

unit_tests/applyxfm4D/applyxfm4D_nn/feedsRun

unit_tests/applyxfm4D/applyxfm4D_ref.nii.gz

unit_tests/applyxfm4D/applyxfm4D_sinc/feedsInputs

unit_tests/applyxfm4D/applyxfm4D_sinc/feedsRun

unit_tests/applyxfm4D/applyxfm4D_singlematrix/feedsInputs

unit_tests/applyxfm4D/applyxfm4D_singlematrix/feedsRun

unit_tests/applyxfm4D/applyxfm4D_spline/feedsInputs

unit_tests/applyxfm4D/applyxfm4D_spline/feedsRun

unit_tests/applyxfm4D/applyxfm4D_transdir/feedsInputs

unit_tests/applyxfm4D/applyxfm4D_transdir/feedsRun

unit_tests/applyxfm4D/applyxfm4D_trilinear/feedsInputs

unit_tests/applyxfm4D/applyxfm4D_trilinear/feedsRun

unit_tests/applyxfm4D/applyxfm4D_userprefix/feedsInputs