Default to using terminfo to set the terminal title

Currently, the title is only set on supported terminals (i.e. xterm,
urxvt, screen etc.). Using terminfo entries to set the terminal title
adds support for many more terminals.

lib/termsupport.zsh

@@ -28,6 +28,14 @@ function title {
       if [[ "$TERM_PROGRAM" == "iTerm.app" ]]; then
         print -Pn "\e]2;$2:q\a" # set window name
         print -Pn "\e]1;$1:q\a" # set tab name
+      else
+        # Try to use terminfo to set the title
+        # If the feature is available set title
+        if [[ -n "$terminfo[fsl]" ]] && [[ -n "$terminfo[tsl]" ]]; then
+		echoti tsl
+		print -Pn "$1"
+		echoti fsl
+        fi
       fi
       ;;
   esac