Merged from trunk -r13754:13764

   Merged from trunk -r13754:13764

   | 13756   | Bug #275947 - Enable build.log when FEATURES=sesandbox is    |
   | zmedico | enabled, since it works when a pty is available (but not     |
   |         | through a normal pipe, due to bug #162404).                  |

   | 13757   | Fix reversal in --nodeps merge order. Thanks to Michael      |
   | zmedico | Haubenwallner <haubi@gentoo.org> for reporting.              |

   | 13758   | Move RootConfig.visible_pkgs to                              |
   | zmedico | dynamic_config._visible_pkgs, so RootConfig can be           |
   |         | considered entirely "frozen".                                |

   | 13759   | Use depgraph._pkg() whenever possible.                       |
   | zmedico |                                                              |

   | 13760   | Add a frozen_config parameter to the depgraph constructor,   |
   | zmedico | so that multiple depgraph instances created for backtracking |
   |         | purposes can reuse the same frozen_config instance.          |

   | 13761   | Use the new frozen_config depgraph constructor parameter to  |
   | zmedico | optimize resume_depgraph().                                  |

   | 13762   | Fix broken reference to self.myopts in the dynamic_config    |
   | zmedico | constructor.                                                 |

   | 13763   | Fix broken reference to _graph_trees.                        |
   | zmedico |                                                              |

   | 13764   | Skip PROVIDE conditional evaluation in                       |
   | zmedico | PackageSet.iterAtomsForPackage(), since Package.metadata     |
   |         | handles that automatically now.                              |

svn path=/main/branches/prefix/; revision=13795