Provides methods and attributes relating to staff.

The following operations are supported. For a formal definition, please review the Service Description.

• getStaffList
  Returns a list of staff based on given parameterized options. All options must have a value of True, False, or Dont_Care. For IsSalesRep and IsMale, the tertiary logic is straightforward:
  
  All Males (IsMale = True)
  All Females (IsMale = False)
  All Males and Females (IsMale = Dont_Care)
  
  The logic used by for class and appoinment instructors is special, and follows the following truth table:
  

  IsClass	IsAppt
  T	T	All Instructors (Class inclusiveOR Appt)
  T	F	Class Instructors (ONLY)
  T	DC	Class Instructors (May also be appt instructors)
  F	T	Appt Instructors (ONLY)
  F	F	Non-Instructors (Staff that do not instruct classes or appts)
  F	DC	Non-Class Instructors (Staff that do not instruct classes)
  DC	T	Appt Instructors (May also be class instructors)
  DC	F	Non-Appt Instructors (Staff that do not instruct appts)
  DC	DC	All Staff