Merged from trunk -r13697:13703

   Merged from trunk -r13697:13703

   | 13698   | Move __init__.py to main.py.                                 |
   | zmedico |                                                              |

   | 13699   | Bug #275532 - In action_depclean(), free memory from the dep |
   | zmedico | calculation before calling unmerge().                        |

   | 13700   | Use clear_caches() to free memory inside action_depclean().  |
   | zmedico |                                                              |

   | 13701   | Make portdbapi define self.settings, for conformity with     |
   | zmedico | other dbapi classes.                                         |

   | 13702   | Fix PROVIDE code since the Package class automatically       |
   | zmedico | evaluates USE conditionals now.                              |

   | 13703   | Use a property to implement portdbapi.settings.              |
   | zmedico |                                                              |

svn path=/main/branches/prefix/; revision=13720