Merged from trunk 7908:7913

   Merged from trunk 7908:7913

   | 7909    | Bump EAPI from 0 to 1 and fix eapi_is_supported() so that it |
   | zmedico | works properly with both 0 and 1.                            |

   | 7910    | When the metadata cache contains a negative EAPI, it means   |
   | zmedico | that the cache entry was generated by a version of portage   |
   |         | that did not support the eapi. When the user upgrades to a   |
   |         | version that now supports the previously unsupported EAPI,   |
   |         | those cache entries need to be regenerated. Therefore, when  |
   |         | a cache entry has a negative EAPI, check if the EAPI would   |
   |         | be supported and trigger a regen if appropriate.             |

   | 7911    | Non-integer EAPI isn't supported. In case it's supported in  |
   | zmedico | the future, assume that it's valid (rather than trigger a    |
   |         | regen).                                                      |

   | 7912    | Fix UnsupportedAPIException.__str__() to strip the leading   |
   | zmedico | negative sign (-) from the EAPI, to prevent confusion.       |

   | 7913    | Add EAPI masking support for binary packages.                |
   | zmedico |                                                              |

svn path=/main/branches/prefix/; revision=7954