Fix/taskLogic

• Validation of PreconditionTasksTree in ProfileService
  • ProfileService will give a warning if a preconditionTree is fullfilled without any tasks beeing performed because this says basically: "you MUST do an OPTIONAL thing"
• request processing will work either way. meaning a session will be created in submittable state if preconditionTree is fullfilled - and only with CREATED state if it is not fullfilled

That bullet is outstanding - but maybe you want to have a look @neil.crossley