Name: hide_inventory - prevent inventory to be printed automatically

Syntax:
	int hide_inventory(string reason)

Description:
	Implementing this function in one of your room allows you to hide
	(or customise) the automatic printing of the room's inventory wenn it
	is entered or the player executes a "look" command.
	
	If this function returns 1 the inventory is not printed automatically.
	This way you can hide the inventory, though it is still possible to
	get things. Another possibility would be to print your own inventory,
	for example hiding small things in a room with high grass.
	
	Probably there are other creative uses.

	Current reason strings are:
	"move_player": call is made because a player enters
	"look": call is made because player looks