Lfun:	query_put_prep() - return a preposition used for put messages

Synopsis:
	string query_put_prep()

Description:
	The return value is used as a preposition for messages if a player
	puts something into the object. If the function is not defined,
	"into" is used.

Return value:
	A string containing the preposition.

Examples:
	query_put_prep() { return "onto"; }

Notes:
	The preposition is only used in messages, NOT for command parsing.
	The only prepositions that are possible in put commands are those
	mentioned in 'help put'.

	The function does only have any effect if the object is a container,
	i.e. has a can_put_and_get()-function returning 1.

See also: helpdir/put, object/can_put_and_get