1. While want to show waterfall, it must be added as the 3rd argument which means the 2nd argument num_eq (by default 8) has to be input!
2. Change the waterfall colormap: from fixed to dynamic in side_info_display.py
3. Remove periodical print for performance consideration.
When two arguments are input (no matter the exact value/form of the 2nd input), the side_ch_ctl will print value only to ease some bash script to call/use further (avoid extra parsing while extra info present)
