SYNOPSIS
	int prevent_insert()

DESCRIPTION
	In compat mode, this function is used by the efun transfer().

	Define this function in objects that are neither living nor
	rooms if you want to prevent to put something into current
	object.

	Return true if ok, otherwise 0. That means that default is
	that it is not possible to put something into an object.

SEE ALSO
	transfer(E), can_put_and_get(A)
