IHW_IRFCURV & IHW_IRFTAB
------------------------

 o In filter curves filter.tab file, widen the filter code column to hold
   the full designation from the filter table and add center wavelength.

 o Chase down "in press" references and update.

 o In irfcurv: see if the temperature at which the data were taken is 
   given in the publication cited in the FITS comments.  If so, add it.
   (Tables 1&2).

 o Look for email from Mike Sitko with specific small corrections.