1.  Reject lines to improve 1D Arc fit RMS:  Orders 89, 90, 100
  --- I wonder if line centroiding is failing in x_templarc
2.  Deal with vignetting at >4000pix in Trace flat
  -- Just blue?
3.  Modify hires_slitflat as Scott suggested (extrapolation)
4.  Worry about scattered light in skysub
5.  Add header to Final files
6.  Subtract scattered light prior to Flat normalization
7.  Consider optical mapping of the wavelength solution
8.  Worry about DETILT for Internal flats
9.  Fit higher order to interpolation in x_fntobj
10.  Set aper according to seeing (i.e. obj profile)
11.  Wavelengths wrong at edge of Order #68?
12.  Add an asymmmetric profile for Optimal (non-parametric?)
13.  Need to improve sky sub for X Optimal
14.  Bluest orders are probably dragging things down in x_fittflat; 
     Consider a separation limit on using it in the fit
     Also check the polynomial order necessary for a good fit
