Name: in_ed - query if a wizard is editing a file

Syntax:
	string in_ed(object wiz);

Description:
	The in_ed efun returns whether a wizard is editing a file or not.

Return value:
	If the object is not interactive or is not given or is not in editor,
	in_ed returns 0, else it returns 1.

Examples:
	is_in_ed = in_ed(this_player());

See also: efun/ed, w/ed, build/ed