add Copyright and GPL license into the Header of Python files

bin/addons/base/__init__.py

bin/addons/base/__terp__.py

bin/addons/base/ir/__init__.py

bin/addons/base/ir/ir_actions.py

bin/addons/base/ir/ir_attachment.py

bin/addons/base/ir/ir_board.py

bin/addons/base/ir/ir_cron.py

bin/addons/base/ir/ir_default.py

bin/addons/base/ir/ir_exports.py

bin/addons/base/ir/ir_fields_description.py

bin/addons/base/ir/ir_model.py

bin/addons/base/ir/ir_report_custom.py

bin/addons/base/ir/ir_rule.py

bin/addons/base/ir/ir_sequence.py

bin/addons/base/ir/ir_translation.py

bin/addons/base/ir/ir_ui_menu.py

bin/addons/base/ir/ir_ui_view.py

bin/addons/base/ir/ir_values.py

bin/addons/base/ir/workflow/__init__.py

bin/addons/base/ir/workflow/print_instance.py