DOC: Added (C) notices and some documentation and comments.

src/main/java/org/caosdb/server/entity/ClientMessage.java

src/main/java/org/caosdb/server/jobs/ScheduledJob.java

...ava/org/caosdb/server/jobs/core/CheckStateTransition.java

...main/java/org/caosdb/server/jobs/core/EntityStateJob.java

...java/org/caosdb/server/jobs/core/InitEntityStateJobs.java

...in/java/org/caosdb/server/jobs/core/MakeStateMessage.java

...n/java/org/caosdb/server/jobs/core/MakeStateProperty.java

src/main/java/org/caosdb/server/transaction/Update.java

...main/java/org/caosdb/server/utils/AbstractObservable.java

src/main/java/org/caosdb/server/utils/Observer.java