Output of format_oi_fits_summary() now clearer.
Changed OI_POLAR ORIENTATION kw to ORIENT, tracking draft OIFITS v2 change.
Replaced OI_SPECTRUM CALIBRATED kw with CALSTAT, tracking OIFITS v2.
Added CORRNAME and CORRINDX_FLUXDATA to OI_SPECTRUM, tracking OIFITS v2.
Replaced OI_SPECTRUM CALIBRATED kw by CALSTAT in bigtest2.fits .