Merged from trunk -r11845:11860

   Merged from trunk -r11845:11860

   | 11846   | Inside depgraph.loadResumeCommand(), initialize              |
   | zmedico | self._scheduler_graph when in --nodeps mode in order to      |
   |         | avoid an AttributeError later when self.schedulerGraph() is  |
   |         | called.                                                      |

   | 11847   | When in --nodeps mode, make Scheduler._set_digraph() discard |
   | zmedico | the digraph and make Scheduler._choose_pkg() always return   |
   |         | the task at the front of the queue.                          |

   | 11848   | Fix logic from previous commit in Scheduler._choose_pkg() to |
   | zmedico | ensure that the --nodeps code is only triggered when --jobs  |
   |         | > 1.                                                         |

   | 11849   | Add git support. Thanks to Daniel Robbins for the initial    |
   | zmedico | patch.                                                       |

   | 11850   | Fix pretend output to show git -a option when committing     |
   | zmedico | signed manifest.                                             |

   | 11851   | Update hardcoded "cvs" error messages to show the correct    |
   | zmedico | vcs value.                                                   |

   | 11852   | Inside have_profile_dir(), check for existence of            |
   | zmedico | profiles.desc since that makes a little more sense thatn     |
   |         | checking for package.mask.                                   |

   | 11853   | Make FindPortdir() return (None, None, None) on failure,     |
   | zmedico | instead of raising a potentially ambiguous ValueError.       |

   | 11854   | Derive the changelog_path variable from the new              |
   | zmedico | checkdir_relative variable.                                  |

   | 11855   | Make FindPortdir() fall back to have_profile_dir() checks if |
   | zmedico | it can't match the current location with anything from       |
   |         | PORTDIR_OVERLAY. Assume that an overlay will contain at      |
   |         | least a "repo_name" file while a master repo (portdir) will  |
   |         | contain at least a "profiles.desc" file.                     |

   | 11856   | Simplify code for cloning config instances inside            |
   | zmedico | Scheduler.merge().                                           |

   | 11858   | Allow --keep-going to continue in some cases when a runtime  |
   | zmedico | dependency has failed to build or install. This involves     |
   |         | pruning off the parts of the graph containing installed      |
   |         | packages with unsatisfied dependencies.                      |

   | 11859   | Make post_emerge() exit early if it detects that the vdb     |
   | zmedico | state hasn't changed. This works by comparing a hash of the  |
   |         | COUNTER values for all packages in the vdb.                  |

svn path=/main/branches/prefix/; revision=11943