Merged from trunk -r11572:11576

   Merged from trunk -r11572:11576

   | 11573   | Mask packages with deprecated EAPIs in order to prevent them |
   | zmedico | from being installed. Such packages will still behave        |
   |         | normally if they are already installed, but preventing new   |
   |         | installation will remind people to update the EAPIs in their |
   |         | overlays if necessary.                                       |

   | 11574   | EAPI 2 is now supported.                                     |
   | zmedico |                                                              |

   | 11575   | Fix code inside BlockerDB.findInstalledBlockers() to         |
   | zmedico | correctly strip multiple "!" characters when necessary. The  |
   |         | code seemed to work fine anyway so this is more a            |
   |         | correctness fix than a bug fix.                              |

   | 11576   | Another correctness fix in                                   |
   | zmedico | BlockerDB.findInstalledBlockers().                           |

svn path=/main/branches/prefix/; revision=11578