TEST SCENARIOS

	simple
		Registers one callout per event type, unregisters them
		and registers them again.

	complex
		Registers around 1300 callouts, then unregisters 130 of them.
		Again registers 1000 callouts more. Then the events are 
		generated at random. Finally callout_map() is used
		to determine the total number of callouts done.

	stress
	 	Try to register a large number of callouts (about 
		50,000 of them). Then try to unregister a callout
		multiple times. Then we try to unregister some randomly
		generated integers. Then we generate the events and
		times.  The callout_map() is used to find the total 
		number of callouts made.

	timing
		registers 100,000 callouts.  Generate about 100,000 events.
		Then genevent() is called 100,000 times. The times
		are subtraced and divided to give the callout
		time for one call.
	

TIMING INFORMATION

	Total time taken to generate 100,000 events = 40 milliseconds
	Number of callouts made = 19999800
	Total time taken to make the callouts = 5212 milliseconds
	Time taken for the dispatches only = 5172
	Average time taken per callout = 258 ns