Merged from trunk -r15770:15780

   Merged from trunk -r15770:15780

   | 15771   | Add copyright header.                                        |
   | zmedico |                                                              |

   | 15775   | Escape hyphens.                                              |
   | zmedico |                                                              |

   | 15776   | Clean up/sync docs for emerge --sync, and add a note about   |
   | zmedico | PORTAGE_SYNC_STALE.                                          |

   | 15777   | Move --update from the actions to the options section.       |
   | zmedico |                                                              |

   | 15778   | When portage upgrades or downgrades itself, preload lazily   |
   | zmedico | referenced portage submodules into memory so that imports    |
   |         | won't fail later.                                            |

svn path=/main/branches/prefix/; revision=15798