clear:

Syntax:	clear ( a )
	clear ( a , ... )

Description:

	Clear effectively deletes a variables object from the symbol
	table. The effect is the variable does not show up when who()
	is used. The memory associated with the variable is freed. 

	Clear accepts up to 32 arguments, the return value is the
	number of objects that have been successfully cleared.

	NOTE: In the not to distant future, `clear()' will delete all
	variables and user-functions.
