extract the vim work around code out to be more explicit
extract the vim work around code out to be more explicit

Add an explaining variable and a comment for the vcol workaround. See
issue #588

nikmartin/dotfiles,wezhang/vim-setup,wezhang/vim-setup,wezhang/vim-setup,wezhang/vim-setup,wezhang/vim-setup,wezhang/vim-setup