Pageviewer data

1. pageview.dat file Structure
   1. filename (actual TIFF file name)
   2. seq (absolute page sequence number within the text item)
   3. pagenum (original text's page number; e.g., 34, xvii, 42a, etc.)
   4. confid (OCR confidence value)
   5. feature (e.g., Table of Contents, Advertisement, Unspecified, Index, etc.)
2. Creation
   1. run the pageview target in the main Makefile
   2. runs the makepageviewdata.pl script