New DTB Level Scan

Urs and Simon,

I added a level scan to the timing tab. But understand that changing the DTB level can have an effect on the timing and vice versa. I also rearranged some of the code to do things consistently between tests such as adding/fixing the location of the timer start position and standardized the trigger buffer and period. I also renamed the save tbm parameters function to save parameters because it saves both the TBM and DTB parameters.

Doug