Raab
defined Problem as an abstract class, moved some funktionality from it
into the SubClass MasterSolutionProblem.
Removed ProblemObjekts in other Classes and TestClasses!
Modified Files:
src/java/de/fhworms/ztt/ox/core/MasterSolutionProblem.java
src/java/de/fhworms/ztt/ox/core/Problem.java
src/java/de/fhworms/ztt/ox/core/StudentSolutionProblem.java
src/java/de/fhworms/ztt/ox/examclient/ExamClientModel.java
src_test/java/unit/de/fhworms/ztt/ox/core/ExamTest.java
src_test/java/unit/de/fhworms/ztt/ox/deployment/AccountBuilderTest.java
src_test/java/unit/de/fhworms/ztt/ox/examserver/RemoteExamTest.java
