How to restore vim screen when exiting

When you exit vim it does not restore the terminal screen (particularly in FreeBSD), here is how to fix that (file ~/.vimrc):

" Restore terminal screen when exiting Vim
if &term =~ "xterm"
  let &t_ti = "\<Esc>[?47h"
  let &t_te = "\<Esc>[?47l"
endif