Lfun:	set_level - set the level of a monster

Synopsis:
	void set_level(int level)

Description:
	The set_level call sets the level of a monster. It is the most
	important function for coding monsters for it sets a variety of
	other variables along with the level, namely 

	all stats (int, con, str & dex), hp (incl. max_hp), sp (incl.
	max_sp), experience, wc and ac.

Return value:
	none

Examples:
	set_level(5);

Note:
	The values of variables stated above set via set_level are not
	bad! There is no need to change them all, especially experience
	and all stats.

	The set ac or wc of monsters with armours and/or weapons will
	change to the ac or wc of the armours or weapons by wearing
	resp. wielding them.

See also: monster/set_name, living/set_int, living/set_con, living/set_str, living/set_dex, monster/set_hp, monster/set_sp, monster/set_ep, monster/set_wc, monster/set_ac