Merged from trunk -r15200:15205

   Merged from trunk -r15200:15205

   | 15201   | Remove ibiblio.org from the default GENTOO_MIRRORS value.    |
   | zmedico | Thanks to Jeremy Olexa <darkside@g.o> for this patch.        |

   | 15202   | Don't bail out if postinst fails. Thanks to Brain Harring    |
   | zmedico | for the suggestion.                                          |

   | 15203   | Support mercurial. Thanks to Rafael Martins                  |
   | zmedico | <rafael@rafaelmartins.com> for this patch.                   |

   | 15204   | Invert some vcs conditionals that are specific to cvs and    |
   | zmedico | svn.                                                         |

   | 15205   | Fix Manifest commit logic for cvs and svn. Thanks to Rafael  |
   | zmedico | Martins <rafael@rafaelmartins.com>.                          |

svn path=/main/branches/prefix/; revision=15206