main must set program_name

[pspp] / ChangeLog

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+2007-01-08  Karl Berry  <karl@gnu.org>
+
+       * doc/error.texi: mention that main() fns must set program_name
+       when progname is used.
+
 2007-01-08  Paul Eggert  <eggert@cs.ucla.edu>
 
        * m4/wctype.m4 (gl_WCTYPE_H): Compute ABSOLUTE_WCTYPE_H even if