refactor: make FileStore implement an interface IFileStore

...ver/source/java/ch/systemsx/cisd/datamover/DataMover.java

...ce/java/ch/systemsx/cisd/datamover/IncomingProcessor.java

...over/source/java/ch/systemsx/cisd/datamover/SelfTest.java

...isd/datamover/filesystem/RemoteMonitoredMoverFactory.java

...ch/systemsx/cisd/datamover/filesystem/intf/FileStore.java

...sx/cisd/datamover/filesystem/intf/IExtendedFileStore.java

...h/systemsx/cisd/datamover/filesystem/intf/IFileStore.java

...cisd/datamover/filesystem/remote/CopyActivityMonitor.java

...msx/cisd/datamover/filesystem/remote/RemotePathMover.java

...temsx/cisd/datamover/filesystem/store/FileStoreLocal.java

...emsx/cisd/datamover/filesystem/store/FileStoreRemote.java

...sd/datamover/filesystem/store/FileStoreRemoteMounted.java

.../systemsx/cisd/datamover/utils/QuietPeriodFileFilter.java

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

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

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