desi_fvc_proc --sequence assumes frames are in order

[dstndstn]

I'm looking at FVC expnum 66575, and it has EXTNAME keys:

> listhead /tmp/fvc-00066575.fits | grep EXTNAME
EXTNAME = 'FVC     '
EXTNAME = 'C0003   '           / name of this binary table extension
EXTNAME = 'F0004   '
EXTNAME = 'C0004   '           / name of this binary table extension
EXTNAME = 'F0005   '
EXTNAME = 'C0005   '           / name of this binary table extension
EXTNAME = 'F0006   '
EXTNAME = 'C0006   '           / name of this binary table extension
EXTNAME = 'F0007   '
EXTNAME = 'C0007   '           / name of this binary table extension
EXTNAME = 'F0008   '
EXTNAME = 'C0008   '           / name of this binary table extension
EXTNAME = 'F0009   '
EXTNAME = 'C0009   '           / name of this binary table extension
EXTNAME = 'F0010   '
EXTNAME = 'C0010   '           / name of this binary table extension
EXTNAME = 'F0011   '
EXTNAME = 'F0000   '
EXTNAME = 'C0000   '           / name of this binary table extension
EXTNAME = 'F0001   '
EXTNAME = 'C0001   '           / name of this binary table extension
EXTNAME = 'F0002   '
EXTNAME = 'C0002   '           / name of this binary table extension
EXTNAME = 'F0003   '
EXTNAME = 'C0037   '           / name of this binary table extension
EXTNAME = 'C0024   '           / name of this binary table extension

ie, all mixed up. It looks like desi_fvc_proc with the --sequence option, however, assumes they are in order, and writes out the first image into output file *-F0000.csv.