Merged from trunk -r14963:14969

   Merged from trunk -r14963:14969

   | 14965   | Bump EAPI conditionals to account for rename of EAPI 3 to 4. |
   | zmedico | Thanks to Jonathan Callen <abcd@g.o> for this patch.         |

   | 14966   | Move ebuild helpers to account for rename of EAPI 3 to 4.    |
   | zmedico |                                                              |

   | 14967   | Add OrderedDict class.                                       |
   | zmedico |                                                              |

   | 14968   | Use OrderedDict in portdbapi.getFetchMap() so that order in  |
   | zmedico | $A corresponds to order in SRC_URI.                          |

   | 14969   | When reading the remote Packages file for --getbinpkg, use   |
   | zmedico | codecs.iterdecode to decode the stream. Also, don't use      |
   |         | finally to close the atomic_ofstream when writing the file   |
   |         | since we want it to abort if an exception is raised.         |

svn path=/main/branches/prefix/; revision=14976