Lab 6

Perform the empty subclass test on your Person class. If it fails, fix the class.
Implement an Employee class that inherits from Person. It should also have department and boss member data, with appropriate accessor methods.
Construct a function, is_important, which returns true if its argument is an important employee. An employee is important if it has no boss or if its boss is in a different department.
Create a subclass of Employee called Manager. Manager has an additional member data, team, which is a list of other employees who are supervised by this manager. team should not be directly modifiable; instead, there should be two methods, team_add and team_remove, which add or remove a specified employee from the manager's team. There should also be a team method which returns the list of employees in the current team.
Modify the Employee::boss accessor so that it automatically updates the boss's team data.
Write a program that reads the HTML files named in its command-line arguments. For each file, it should print out the text contained in the file's <H1>, <H2>, <H3>, <H4>, <H5>, and <H6> elements.
If you have time, add a new method, perform_task, to your Employee class. If the target object is a regular Employee, then perform_task should takes a string argument and print out
```
        <Employee name>: I am staying late today to work on <...>.
```
But if the employee is a manager whose TEAM data is nonempty, it should instead select a team member at random, print
```
        <Manager's name>: <Subordinate's name> will take care of this
                          while I play golf.
```
Then it should delegate the perform_task call to the employee it has chosen.