Create standard-class as variable in standard-class.el
* metaobjects/standard-class.el
  (moped-make-standard-class-metaobject): removed; since only one such
  object is required, it is just stored in the variable
  `moped-standard-class-metaobject'
  (moped-standard-class-metaobject): new variable; stores the
  standard-class metaobject