DEFAULT: modulate affine registration tolerance

I have noticed that the initial affine registration does not properly align the template to some subject images, so that the following diffeo+affine starts in a sub-optimal alignment. Modulating the affine tolerance seems to solve this. It does increase runtime, but not by much, as if is only applied to the coarsest level of the algorithm.

spm_mb_fit.m

@@ -107,7 +107,7 @@
     % Finished rigid alignment?
     % Note that for limited field of view templates, the objective
     % function can increase as well as decrease.
-    if it0>12 && abs(oE-E/nvox(dat)) < sett.tol*2
+    if it0>12 && abs(oE-E/nvox(dat)) < sett.tol*1e-1*0.5
         countdown = countdown - 1;
         if countdown==0
             break;