* Minor refactorings for Level2Activity
   Status of this issue is done as of this revision.
refs #2 Level 2 (Daisy)
refs #4 Level three
 * Level three is done as of this revision.
   Note: Minimum required changes are included, plus some(hard to
   ignore) refactorings.
 * Minor improvemnets for look and feel.
   Status of this issue is done as of this revision.
refs #3 Game score and one-step-back feature.
refs #5 Level four to eight
 * GridContainerLevel4Test shows how new logic(square type 2x1) is,
   well, tested.
   Note: Thank you to creator of (idea of) automate(output) testing.