Check invalid cursor position only when auto_linebreaks enabled (#109)

* Check invalid cursor position only when auto_linebreaks enabled
* Fixed too long line

RPLCD/lcd.py

@@ -150,7 +150,8 @@ def _get_cursor_pos(self):
     def _set_cursor_pos(self, value):
         if not hasattr(value, '__getitem__') or len(value) != 2:
             raise ValueError('Cursor position should be determined by a 2-tuple.')
-        if value[0] not in range(self.lcd.rows) or value[1] not in range(self.lcd.cols):
+        if self.auto_linebreaks and \
+                (value[0] not in range(self.lcd.rows) or value[1] not in range(self.lcd.cols)):
             msg = 'Cursor position {pos!r} invalid on a {lcd.rows}x{lcd.cols} LCD.'
             raise ValueError(msg.format(pos=value, lcd=self.lcd))
         row_offsets = [0x00, 0x40, self.lcd.cols, 0x40 + self.lcd.cols]