use regex to chop selected traces

Hi Sebastian,

After I generated some markers using cake I wanted to cut the concerning traces using the `chopper_selected_traces()` method. That caused an except because these markers have wild cards as channel ids. Using `marker.match_nsl(tr.nslc_id)` in `chopper_selected_traces` resolves this problem. 

Apart from that, I added some caption to replace some "untitled window"'s titles. 

Best

Marius