Following of the flow list
- ConsoleState now has a follow_focus property
-- when True it will cause focus to follow added flows
- ConsoleMaster implements toggle_follow_flows()
-- when enabling follow, also jumps to most recent flow
- StatusBar reports follow_focus state
-- adds "following" to option list when true
- Added "F" to FlowList keys
-- implementation requests ConsoleMaster to toggle_follow_flows()
- Flows are backed up whenever an interactive, non-script change is made.
- That backup is canonical and never changed - "V" will always revert to it.
This makes more sense than what we had previously....
