Modified files:
usr.bin/mandoc : out.c

Log message:
Better handle automatic column width assignments in the presence of horizontal spans, by implementing a moderately difficult iterative algoritm. The benefit is that spans containing long text no longer cause an excessive width of their starting column.

Also, use unicode for drawing: https://marc.info/?l=openbsd-cvs&m=154338047707592&w=2

And some other assorted commits that are fun.