Added a VO colorscheme directory; like we had in the old days.
Removed color file.
Added a color scheme setting.
Added a list-based tags feature similar to org-mode.
Syntax Example:
	[_] 0% Heading [tag] [tag] [tag]
	    [_] 0% Heading [tag] [tag] [tag]
Commands:
	,,ct	set tag to next tag in current tag list
	,,cT	set tag to first tag in next tag list
Examples in vimoutliner/plugin/votl_checkbox.otl
Minor edit of comments.