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im_w_of_x(), reduce calls and branches and FDIVs

reduce calls and branches and FDIVs within im_w_of_x(x)

  1. move "100/(1-x)" into w_im_y100(x) and remove 1st parameter (no FDIV needed for |x|<0.03)
  2. move Taylor expansion for small x (|x| <= 0.0309...) into im_w_of_x(x)
  3. check for isnan(x) istead (iy<0), (x != x) == isnan(x)
  4. comment out printf(DEBUG)
  5. reduce branches in im_w_of_x() and reduce duplicated code