various fixes (post_sample_tube, timing etc.)

app_utils.py

@@ -34,12 +34,12 @@ def assert_tweaker_positions(targets, timeout=60.0):
       pend_event()
       cur=motor.get_rbv()
       done=motor.is_done()
-      _log.debug("check {}[done={}]: {} == {}".format(name, done, cur, target))
-      summary.append("{}[done={}]: {} == {}".format(name, done, cur, target))
+      s=f"check {name} {cur:.5g} == {target:.5g} [done={done}]"
+      _log.debug(s)
+      summary.append(s)
       if done and tolerance>=abs(cur-target):
         count+=1
       pend_event(0.1)
-
     if count==num_motors:
       break
     pend_event(0.1)