add macro block

GroupedProjections.ijm

+macro "Grouped Projections" {
 // Creates stack projections for subgroups
 //  and saves them to disk.
 
@@ -117,3 +118,4 @@ function getBar(p1, p2) {
     if (index>n-1) index = n-1;
     return substring(bar2, 0, index) + substring(bar1, index+1, n);
 }
+}
\ No newline at end of file