add proxy method Command::getKernel()
remove old and unnecessary MigrateDbCommand
add EntityManager::setFree() - a proxy to detach()
add a comment for the apibot $logins variable
remove Book::getTextAnnotations()
comment out old code in Book
remove Text::[get|set|has]Cover()
define some undefined fields in Text
remove unnecessary methods from TextAuthor
define some undefined fields in TextDownloadService