Added (some of the) calculations for the examine command.

[pspp] / THANKS

Thanks to...
                                       
     * David MacKenzie for writing Autoconf, the automatic configuration
       tool.
     * David MacKenzie and Tom Tromey for writing Automake, the tool for
       generating `Makefile's.
     * Ulrich Drepper et al for writing gettext, the GNU
       internationalization package.
     * François Pinard for advice on proceeding with development.
     * Jim Van Zandt for Debian packaging and suggestions.
     * Torbj"orn Granlund and TMG Datakonsult for GNU gmp2 used in the 
       portable file routines.