Lfun:	set_aggressive - make a monster aggressive

Synopsis:
	void set_aggressive(int agg)

Description:
	The set_aggressive call controls a monster's aggressiveness.
	If the argument is 1, it will get aggressive; if the argument
	is 0, it quits being aggressive.

	Being aggressive means that the monster tries to attack any
	player that enters the room (after a short delay).

Return value:
	none

Examples:
	set_aggressive(1);

Note:
	The default is NOT aggressive! And this will stay the default.
	There is no need to set all monsters to non-aggressive ;-)

See also: monster/query_aggressive, monster/set_wimpy, living/query_wimpy, monster/set_brave, monster/query_brave