There seem to be two ways of telling vile where to end lines:-
wrapmargin - sets the size of the gap at the right hand side, if
you want 72 column text when typing in an 80 column window you set
wrapmargin=8. As you type text is wrapped by inserting real
newline characters when the limit is reached.
The *big* disadvantage of wrapmargin is that you can't set it so
you get a fixed text width in varying window sizes.
fillcol/wrapwords - (wrapwords is deprecated) Otherwise this would
appear to do what one wants in variable sized windows. I.e. I
could set fillcol to 72 and set wrapwords and all text would wrap
at 72 columns even when I'm using wider windows.
Why is fillcol deprecated? Is it likely to disappear?