shim change shock compression

Add 'sh comp' shim changes. For this to work well, the cadj must be the same or very similar for each test. You need to know the 2nd test number to be compared against. stack1 = current stack in question stack2 = stack to compare against [click for shc area choices]

shock compression       rec_id for stack 1        1   enter rec_id for stack 2           [current compare against]