add: support for rsync append mode for rsync versions 2.6.7 or newer

...er/source/java/ch/systemsx/cisd/datamover/Parameters.java

...x/cisd/datamover/filesystem/FileSysOperationsFactory.java

...x/cisd/datamover/filesystem/remote/rsync/RsyncCopier.java

...atamover/filesystem/remote/rsync/RsyncVersionChecker.java

...a/ch/systemsx/cisd/datamover/intf/IFileSysParameters.java

...eTest/java/ch/systemsx/cisd/datamover/ParametersTest.java

.../datamover/filesystem/remote/CopyActivityMonitorTest.java

...sd/datamover/filesystem/remote/rsync/RsyncCopierTest.java