Unit tests for featdesign module. Still need to test voxelwise EVs

tests/testdata/test_feat/2ndlevel_1.gfeat/design.mat

...stdata/test_feat/2ndlevel_1.gfeat/inputreg/masksum.nii.gz

...est_feat/2ndlevel_1.gfeat/inputreg/masksum_overlay.nii.gz

...ata/test_feat/2ndlevel_1.gfeat/inputreg/maskunique.nii.gz

..._feat/2ndlevel_1.gfeat/inputreg/maskunique_overlay.nii.gz

tests/testdata/test_feat/2ndlevel_1.gfeat/mask.nii.gz

tests/testdata/test_feat/2ndlevel_1.gfeat/mean_func.nii.gz

tests/testdata/test_feat/2ndlevel_2.gfeat/bg_image.nii.gz

tests/testdata/test_feat/2ndlevel_2.gfeat/cope1.feat/.flame

...at/2ndlevel_2.gfeat/cope1.feat/cluster_mask_zstat1.nii.gz

...t_feat/2ndlevel_2.gfeat/cope1.feat/cluster_zstat1_std.txt

...testdata/test_feat/2ndlevel_2.gfeat/cope1.feat/design.con

...testdata/test_feat/2ndlevel_2.gfeat/cope1.feat/design.fsf

...testdata/test_feat/2ndlevel_2.gfeat/cope1.feat/design.grp

...estdata/test_feat/2ndlevel_2.gfeat/cope1.feat/design.lcon

...testdata/test_feat/2ndlevel_2.gfeat/cope1.feat/design.lev

...testdata/test_feat/2ndlevel_2.gfeat/cope1.feat/design.mat

...test_feat/2ndlevel_2.gfeat/cope1.feat/example_func.nii.gz

...eat/2ndlevel_2.gfeat/cope1.feat/filtered_func_data.nii.gz

...test_feat/2ndlevel_2.gfeat/cope1.feat/lmax_zstat1_std.txt