Update CPAN to CPAN version 2.00-TRIAL

  [DELTA]

  2013-02-06  k  <k@k83.linux.bogus>

    * release 2.00-TRIAL

    * import App::Cpan 0.60_02 from brian d foy

    * RT#82589 doc fix thanks to Zefram

    * several portability fixes for 5.6.2

    * RT#83042 workaround for current circular dependency in CPANPLUS and
      CPANPLUS::Dist::Build