Merged from trunk -r13286:13290

   Merged from trunk -r13286:13290

   | 13287   | If there are not ebuilds matching a argument, only generate  |
   | zmedico | an error if there are also no cache entries matching the     |
   |         | argument.                                                    |

   | 13288   | Always generate an error if the target cache contains an     |
   | zmedico | apparently invalid cpv.                                      |

   | 13289   | Add an example for PORTAGE_IONICE_COMMAND. Thanks to         |
   | zmedico | Vlastimil Babka <caster@g.o> for the suggestion.             |

   | 13290   | Bug #262647 - Inside config.setcpv(), never add SRC_URI to   |
   | zmedico | the environment since that can cause execve() calls to fail  |
   |         | with E2BIG errors.                                           |

svn path=/main/branches/prefix/; revision=13318