WRITE some commands

MODIFIED codereader.py     - write reading module
MODIFIED codeviewer.py     - write viewing module
MODIFIED debugger.py       - write 1,2,6 commands
NEW FILE interface.py      - write debugger's shell
NEW FILE pep8.py           - write pep8 module
NEW FILE pep8out.py        - write module for pep8 module for out pep8 errors