multiple lines/grid view of boards to prevent horizontal scrolling

[chad-bennett]

Instead of boards scrolling horizontally, have controls to set multiple rows or a grid view that wraps to fit to screen.

My use-case is a weekly calendar with lists per day as well as lists for things to do and things not yet done at end of week. That makes for nine lists on one board. There's a lot of horizontal scrolling as the week goes on.