BIS-753: Made file upload work for small files.

...src/main/java/ch/ethz/sis/afsclient/client/AfsClient.java

...-server-javascript/src/js/api/server-data-store-facade.js

...server-javascript/src/js/demo/server-data-store-client.js

...stem/src/main/java/ch/ethz/sis/afs/api/OperationsAPI.java

...in/java/ch/ethz/sis/afs/dto/operation/WriteOperation.java

...rc/main/java/ch/ethz/sis/afs/exception/AFSExceptions.java

...n/java/ch/ethz/sis/afs/manager/TransactionConnection.java

...hz/sis/afs/manager/operation/CreateOperationExecutor.java

...thz/sis/afs/manager/operation/WriteOperationExecutor.java

...e-system/src/main/java/ch/ethz/sis/shared/io/IOUtils.java

...main/java/ch/ethz/sis/afsserver/worker/AbstractProxy.java

...java/ch/ethz/sis/afsserver/worker/proxy/AuditorProxy.java

.../ethz/sis/afsserver/worker/proxy/AuthenticationProxy.java

...h/ethz/sis/afsserver/worker/proxy/AuthorizationProxy.java

...ain/java/ch/ethz/sis/afsserver/worker/proxy/LogProxy.java

...a/ch/ethz/sis/afsserver/worker/proxy/ValidationProxy.java

ui-admin/index.html

...components/database/data-browser/DataBrowserController.js