Code Refactored (code immigrations from '__init__' to 'cell.py', 'auto.py', 'validity.py' and 'debug.py')

CHANGED :
1. code refactorized.
2. changed comment style from doxygen-style html to just doxygen style text.

TODO :
1. import dependecy hasn't been resolved.
2. table auto configuring feature has to be added to 'auto.py'.
3. validity checking algorithm has to be improved in 'auto.py' and 'validity.py'.