Update DPARSFA_run.m

error message:
??? Undefined function or variable "AllVolume".
Error in ==> DPARSFA_run_mod at 1065
            AllVolume=mean(AllVolume,4);

the 4D matrix was named "Data" but computation is made on "AllVolume"
now the mean-functional it is computed and saved correctly.
Next issue: Coreg-estimate it is computed without errors but T1ImgCoreg content it is still a copy of T1Img content.
Merge pull request #1 from Stefano-Orsolini/patch-1

Update DPARSFA_run.m