Update y_AlphaSim.m

After observing a problem with AlphaSim for small masks in combination with high smoothness, I looked into this code and edited it. The most important point is the relocation of the application of the mask. Initially this was done before the the gauss filter but the gauss filter will blur the bounderies of the masked region which will cause problems later in the code.
A more detailed description of the edits can be found here:
http://rfmri.org/content/alphasim-problem-critical-bug
Merge github.com:KathW/DPABI into develop
To test AlphaSim Update
Add *~ to ignore file
Add Residual Output after statistical analysis
Fixed Output Error of Residual
Change RMS to SSE
Fixed a bug when execute easythresh to T, F, R