concurrent control mechanism modified.

...rc/de/fu_berlin/inf/dpp/concurrent/ConcurrentManager.java

...pp/concurrent/jupiter/internal/JupiterDocumentClient.java

...pp/concurrent/jupiter/internal/JupiterDocumentServer.java

...dpp/concurrent/jupiter/internal/ProxyJupiterDocument.java

.../dpp/concurrent/management/ConcurrentDocumentManager.java

...nf.dpp/src/de/fu_berlin/inf/dpp/editor/EditorManager.java

....dpp/src/de/fu_berlin/inf/dpp/net/IActivitySequencer.java

.../de/fu_berlin/inf/dpp/net/internal/ActivitySequencer.java

...e/fu_berlin/inf/dpp/net/internal/XMPPChatTransmitter.java

.../de/fu_berlin/inf/dpp/project/internal/SharedProject.java

.../src/de/fu_berlin/inf/dpp/util/PacketProtokollLogger.java