relax comparison to assert_array_almost_equal in test_apply_affine
relax comparison to assert_array_almost_equal in test_apply_affine

otherwise leads to silly failure due to minuscule loss of precision
during operation:

AssertionError:
Arrays are not equal

(mismatch 16.6666666667%)
 x: array([[[-0.50688799, -1.66266008, -4.00463121],
        [ 3.34535676, -0.93336192,  0.81055908],
        [ 1.8903341 , -0.50335599, -3.35445869]],...
 y: array([[[-0.50688799, -1.66266008, -4.00463121],
        [ 3.34535676, -0.93336192,  0.81055908],
        [ 1.8903341 , -0.50335599, -3.35445869]],...


(Pdb) print x
[[[-0.50688799 -1.66266008 -4.00463121]
  [ 3.34535676 -0.93336192  0.81055908]
  [ 1.8903341  -0.50335599 -3.35445869]]

 [[ 0.65062492 -1.29969132 -2.77813354]
  [ 4.01248837  0.63213532 -0.52546691]
  [-6.76387776 -0.60131449  0.17963992]]]
(Pdb) print y
[[[-0.50688799 -1.66266008 -4.00463121]
  [ 3.34535676 -0.93336192  0.81055908]
  [ 1.8903341  -0.50335599 -3.35445869]]

 [[ 0.65062492 -1.29969132 -2.77813354]
  [ 4.01248837  0.63213532 -0.52546691]
  [-6.76387776 -0.60131449  0.17963992]]]
(Pdb) print x - y
[[[  0.00000000e+00   0.00000000e+00   0.00000000e+00]
  [  0.00000000e+00   0.00000000e+00   0.00000000e+00]
  [  2.22044605e-16   0.00000000e+00   0.00000000e+00]]

 [[ -1.11022302e-16   0.00000000e+00   0.00000000e+00]
  [ -8.88178420e-16   0.00000000e+00   0.00000000e+00]
  [  0.00000000e+00   0.00000000e+00   0.00000000e+00]]]

nipy/nireg,bthirion/nipy,alexis-roche/nireg,alexis-roche/niseg,arokem/nipy,alexis-roche/nipy,alexis-roche/nipy,arokem/nipy,arokem/nipy,bthirion/nipy,bthirion/nipy,alexis-roche/nipy,alexis-roche/register,alexis-roche/nireg,arokem/nipy,alexis-roche/niseg,alexis-roche/register,nipy/nipy-labs,nipy/nireg,alexis-roche/register,alexis-roche/nipy,nipy/nipy-labs,bthirion/nipy