Fix index error (Matlab starts at 1).

@@ -116,8 +116,8 @@ function ImaGIN_SpikesDetection(S)
         chunk_nb = fix(size(timeseries,2)/chunk_length);
         if chunk_nb>0
             for kk=1:chunk_nb
-                idx_start = (kk-1)*chunk_length;
-                idx_end = (kk)*chunk_length;
+                idx_start = ((kk-1)*chunk_length)+1;
+                idx_end = ((kk)*chunk_length);
                 chunk_timeseries = timeseries(:,idx_start:idx_end); 
                 chunk_zeroed = zeroed(:,idx_start:idx_end); 
                 chunk_table{end+1} = spikes_from_monopolar(srate,labels,chunk_timeseries,chunk_zeroed,coordinates,path_out);