Merged from trunk -r13804:13812

   Merged from trunk -r13804:13812

   | 13805   | Bug #276957 - Fix dropped "in graph" choice for runtime deps |
   | zmedico | inside dep_zapdeps.                                          |

   | 13806   | Fix --selective so it works.                                 |
   | zmedico |                                                              |

   | 13807   | Document the --selective option.                             |
   | zmedico |                                                              |

   | 13808   | Add a --debug warning message inside _add_pkg in case a      |
   | zmedico | potentially infinite backtracking loop is detected (it       |
   |         | should never happen).                                        |

   | 13809   | Use a dict for depgraph params, so we can use it to store    |
   | zmedico | key/value pairs and fix the depgraph so it doesn't use       |
   |         | emerge options directly.                                     |

   | 13810   | Make -j argument handling more generic, so it's easy to add  |
   | zmedico | similar arguments (planning to add support for integer       |
   |         | -D/--deep arguments).                                        |

   | 13811   | Tweak arguments for <python-2.6 compat.                      |
   | zmedico |                                                              |

   | 13812   | Allow --deep to take an optional integer parameter, to       |
   | zmedico | specify how deep it should go. Also make --update so it no   |
   |         | longer implies the equivalent of --deep=1. To get the old    |
   |         | --update behavior, use --update --deep=1.                    |

svn path=/main/branches/prefix/; revision=13813