Merged from trunk 8542:8585

   Merged from trunk 8542:8585

   | 8543    | Don't unset ${S} inside save_ebuild_env().                   |
   | zmedico |                                                              |

   | 8559    | * Remove bogus "ci" mode. * Sync "scan" mode description     |
   | zmedico | with 2.1.2 branch.                                           |

   | 8569    | Move preinst IMAGE initialzation before bashrc handling.     |
   | zmedico |                                                              |

   | 8573    | Clean up some local variables that are needlessly saved in   |
   | zmedico | the environment.                                             |

   | 8575    | Move environment saving from dyn_compile() to dyn_install()  |
   | zmedico | so that state from src_install() is saved.                   |

   | 8577    | Generate an eerror elog message when an ebuild prerm or      |
   | zmedico | postrm phase fails.                                          |

   | 8578    | Fix the diefunc overlay message so that it doesn't trigger   |
   | zmedico | falsely in prerm or postrm.                                  |

   | 8581    | * Make save_ebuild_env() filter some more variables. * Make  |
   | zmedico | dyn_install() filter S when it's no longer needed.           |

   | 8583    | In dyn_install(), don't cleanse S from the global            |
   | zmedico | environment, in case the user wants to repeat the phase      |
   |         | (like with FEATURES=noauto and the ebuild command). Only     |
   |         | cleanse it from environment.bz2.                             |

   | 8585    | Replace usage of the "myarg" global variable with the        |
   | zmedico | equivalent readonly EBUILD_SH_ARGS variable.                 |

svn path=/main/branches/prefix/; revision=8589