1. Added links to Flicker, Checkerboard and Movie logic.
2. Added Flicer button logic, but only the button works (it changes the foreground opacity from 1 to 0, alternetavely). It doesn't change over time. I tried to do this, but the logic screen doesn't update until the logic is completed.
3. Currently I use GlyphPointMax value for alternating opacity in Flicker, because newly added FlickerOpacity doesn't work yet. Need to fix it.
1. Inserted FlickerOpacity in Registration Quality Node.
2. Added CheckerboardLogic.

Known Errors:
1. CheckerboardVolumeComboBox doesn't work properly - one cannot create new volumes.
2. In CheckerboardVolumes the CopyVolume logic doesn't work.
3. When running SlicerDIRQA module, I get error: " This function is deprecated. Use setCurrentNodeID() instead " Don't know from where?