page level doc blocks and class descriptions

lib/public/activity/iconsumer.php

lib/public/activity/imanager.php

lib/public/appframework/app.php

lib/public/appframework/iapi.php

lib/public/authentication/iapachebackend.php

lib/public/files/alreadyexistsexception.php

lib/public/files/entitytoolargeexception.php

lib/public/files/file.php

lib/public/files/invalidcontentexception.php

lib/public/files/invalidpathexception.php

lib/public/files/notenoughspaceexception.php

lib/public/files/notfoundexception.php

lib/public/files/notpermittedexception.php

lib/public/files/storage.php

lib/public/iaddressbook.php