BUG: remove tmp files after termination

src/main/java/caosdb/server/CaosDBException.java

.../caosdb/server/resource/AbstractCaosDBServerResource.java

src/main/java/caosdb/server/resource/ScriptingResource.java

src/main/java/caosdb/server/scripting/CallerSerializer.java

...va/caosdb/server/scripting/ServerSideScriptingCaller.java

src/main/java/caosdb/server/utils/Serializer.java

...st/java/caosdb/server/resource/TestScriptingResource.java