books/bookvol10.3 add help for AntiSymm

add help for exported functions in AntiSymm
books/bookvol10.3 fix iOrder in ISUPS for finite args

    iOrder(st,n,refer) ==
      explicitlyEmpty? st =>
        finite?(n) => retract(n)@Integer
        error "order: series has infinite order"

in order to make this work:
  w:SparseUnivariateLaurentSeries(Fraction(Integer),'z,0):=0
  order(w,0)
  rationalFunction(w,0)