Revert previous deletions in ParametersStorage
Do proper revert of ParametersStorage
Fix probeService
Fix repercussions of fixing ProbeService
PollService is now ProbeService
Further mega-refactoring: building sequences is done

Next steps are:
* reworking the parameter storage layer to accept future grammar v3
* finish implementing all the background classes with a lesser grammar
  v3
* rework the views layer to work with new background classes
* augment grammar v3 to accept multi-page questions and conditionals