Check if mask and input have the same spacing to compute SUVPeak

Check if mask and input have the same spacing to compute SUVPeak

Before, the output of the SUVPeak was unrealistic with a mask with a spacing different from the input.
Now, check if they have the same spacing. If not, the script raises an error.

I add an option (--allow_resize) to automatically resize the mask according to the input like in the clitkImageStatistics script