fix bug with ctrl+d leaving the tty in an unknown state

clite/core.js

@@ -2815,6 +2815,11 @@ clite.tty = {
 		case 'rows':
 			return t.data.length;
 			break;
+		case 'sane':
+			t.raw = false;
+			t.echo = true;
+			return true;
+			break;
 		default:
 			return false;
 		}

clite/shell.js

@@ -982,6 +982,7 @@ Options:
 			switch (str) {
 			case String.fromCharCode(4):
 			case 4:
+				term.ttyctrl('raw',false);
 				doShellExit(0);
 				break;
 			case '\t': // tab

clite/user.js

@@ -549,6 +549,8 @@ Options:
 			return 1;
 		}
 
+		term.ttyctrl('sane');
+
 		if (user != null) {
 			setUser(user);
 			return null;