sequence correct for all-col, grid layout required for 2-col, 4-col
removed obsolete js
removed till grid layout stabilised
+dev css/-debug css
first workable hybrid bootstrap + js layout, note: .row must have position:relative otherwise bootstrap offset uses the wrong relative with (from the body)
semi-functional responsiveness, due to the relative width of columns, it appears that the layout must be regenerated at each resize - precomputed css for other widths will NOT WORK
windows resize event regenerates timeline layout
bugfix: non-removal of previously set offset classes during resize
comment clarification
removed legacy debug code
incomplete mod for arrows pointing right, only works on -md and larger