Earlier version generated a lot of blank cell info.
This version trims each unicode block down to the range
of available glyphs.

e.g.
--rw-r--r-- M 9 chris chris 38803 Aug 13 14:16 comic.14.e000-f8ff
goes to
--rw-r--r-- M 9 chris chris 433 Aug 13 16:09 comic.14.f001-f005

Chris.