ssdm-13365: moved file-transfer to another repo

.../source/java/ch/ethz/sis/filetransfer/IUserSessionId.java

...ce/java/ch/ethz/sis/filetransfer/IUserSessionManager.java

...thz/sis/filetransfer/InvalidDownloadSessionException.java

...ethz/sis/filetransfer/InvalidDownloadStreamException.java

...ch/ethz/sis/filetransfer/InvalidUserSessionException.java

...ansfer/source/java/ch/ethz/sis/filetransfer/LogLevel.java

...sfer/source/java/ch/ethz/sis/filetransfer/NullLogger.java

...rce/java/ch/ethz/sis/filetransfer/PayloadInputStream.java

...ansfer/source/java/ch/ethz/sis/filetransfer/ToString.java

...r/source/java/ch/ethz/sis/filetransfer/UserSessionId.java

...t/java/ch/ethz/sis/filetransfer/ChunkInputStreamTest.java

...est/java/ch/ethz/sis/filetransfer/DownloadClientTest.java

...ceTest/java/ch/ethz/sis/filetransfer/DownloadExample.java

...ava/ch/ethz/sis/filetransfer/DownloadInputStreamTest.java

.../java/ch/ethz/sis/filetransfer/FailingDownloadServer.java

...t/java/ch/ethz/sis/filetransfer/FailingDownloadStore.java

...eTest/java/ch/ethz/sis/filetransfer/FailureGenerator.java

...est/java/ch/ethz/sis/filetransfer/HttpDownloadServer.java

.../ethz/sis/filetransfer/InconsistentCRCDownloadServer.java

...java/ch/ethz/sis/filetransfer/PayloadInputStreamTest.java