* for ScalegridShape2Degree added the appropriate question
* experimented with save/restore objects to/from dB
* primitive persistence for the AQuestion of ScalegridShape2Degree lesson
* removed sample classes for ORMLite framework
Added visualization of metrics for ScalegridDegree2Position, incl. dB persistance

The metrics for the lesson above is added. The scalegrid (currently, only Alpha)
is presented on the fretPosition=0, representing the quality of answers on the
all fret for scale grid Alpha.

To make metrics visualization work, i have implemented persistance for:
 - appropriate question class
 - QuestionMetrics class