fix some bugs

- ENH : move the process of loading data in class team, out of the main_widget
- FIX : figure out the error in table displaying when sorting is enabled.
- FIX : fix the bug in setting info after searching
- FIX : fix the bug in searching after sorting with table headers
- ENH : enhance the team class
- FIX : fix the bug in refreshing data after kicking out member