use_versioned_archname => versionedarchname

(now synced with meta)
INSTALL: Fix pod verbatim lines

These are fixed to correctly line up and to fit into 79 columns
lib/Unicode/UCD.pm: Clarify pod
utf8.h, utfebcdic.h: Add, fix comments
Update Archive-Extract to CPAN version 0.68

  [DELTA]

  Changes for 0.68    Fri Feb 15 22:57:09 2013
  ============================================
  * Solaris' tar doesn't like some archives on
    CPAN, prefer gtar if it is available
Document in perldelta, new diag and Configure option.