[DMV-33] add support for password files when connecting to an rsync server

.../java/ch/systemsx/cisd/common/filesystem/IPathCopier.java

...ch/systemsx/cisd/common/filesystem/rsync/RsyncCopier.java

...ystemsx/cisd/common/filesystem/rsync/RsyncCopierTest.java

...e/java/ch/systemsx/cisd/datamover/DatamoverConstants.java

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

...source/java/ch/systemsx/cisd/datamover/PropertyNames.java

...msx/cisd/datamover/filesystem/intf/AbstractFileStore.java

...rceTest/java/ch/systemsx/cisd/datamover/SelfTestTest.java