make :15 minute marks smaller (but still big enough to click on) and added borders so we can see them.  Refs #4716
make :15 minute marks smaller (but still big enough to click on) and added borders so we can see them.  Refs #4716

git-svn-id: 674a2d6b1e32e53f607eb824547723f32280967e@10839 560b804f-0ae3-0310-86f3-f6aa0a117693

Sam-Cummins/delite,kitsonk/delite,kitsonk/delite,harbalk/delite,Sam-Cummins/delite,harbalk/delite